I've related much concerning one of my vehicles here using the EZ EFI 2.0 Throttle Body system, so I guess my experiences with a second system in another vehicle may also be helpful. Here's a link to the first system - http://www.cpgnation.com/forum/thre...with-dual-plane-intake-vs-single-plane.25871/ Vehicle number two is a power everything 1981 GMC Sierra Classic, with a 355 Chevy small block I built and installed to the truck in 1993. The engine, as built then, made a reliable 350 horsepower on the dyno (actually about 25 more). I put a total of 36,000 miles on the engine after the install, and never changed anything but the plugs and wires, oil, antifreeze, and other normal service items. The engine has forged pistons, stage two rods, and other goodies inside. After 23 years, I figured it was time for a refresh with some upgrades even if the engine still did run great. A number of things had quit working like the truck's R12 air conditioning. I installed a new compressor, hoses, evaporator valve, a new evaporator filter, and a new pressure switch - all for use with R4 refrigerant and oil. That just wetted my appetite with the AC working again. So I installed new tires and rims. I started enjoying driving the old truck again with its antique tag and it's loud turbo muffler exhaust. Lol, the hot rodder in me surfaced again. So, I purchased Trick Flow 195 "Fast As Cast" heads, A Super Victor intake, a COMP XFI HR cam, and all the roller goodies needed to up the power. I also peeled the old rusty headers to install a new set of stainless steel "shorty" headers, and installed a new X-pipe stainless PYPES Race Pro 2 1/2" dual exhaust with straight through perforated pipe mufflers in place of the 23 year old rusty dual steel exhaust and turbo mufflers. In the process, I installed a new Hooker cross member (actually for LS engine swaps) in order to tuck the exhaust higher. The Hooker cross member worked very nicely. The installed new exhaust left me shell shocked - the old exhaust had always been very loud, and this one isn't much louder than the exhaust on my new stock Chevy Silverado - even when I rev the GMC. I knew the old 2500 stall converter in the turbo 350 I had built with a B&M upgrade kit didn't seem to be working correctly when under pressure, for some years - even though the transmission still shifted nice and crisp. With the new parts and the EZ EFI 2.0 Throttle Body installed, everything had been working great - until I decided to drive the truck recently to fill a 55 gallon drum with diesel fuel. The engine was running great, but I soon began noticing the transmission shifts weren't crisp and were getting weaker. Fluid was 1 pint low but clean, and I added some as I looked at the modulator, lines, and TV cable. I nursed the truck seven miles back toward home at all of 30 miles per hour on level ground. Attempting more speed just revved the engine. With the one hill near my home, I put the truck in reverse and drove the last two miles home in reverse - knowing the forward gears would never pull the hill. Happily, reverse was still working good and I got home without a the need of a tow. Once there, I found the forward drive couldn't move the truck with so much as my foot holding pressure on level ground. I could actually physically roll the truck backwards in drive with one foot on the ground. Yes, this should be expected since the engine now makes some 450 horsepower or better, but I hadn't stuck my big foot into it at all. Either a seal began leaking or the old converter lost a piece of something into the front clutch pack - should have changed that thing long back, but didn't. Anyway, I'll have a new TCI stall converter and Street Fighter Transmission to install come Tuesday. I just don't feel like rebuilding the old transmission, and I would still need additional parts to beef the transmission up to the new horsepower level. The new TCI should be good for 575 ponies - well above my 355's new horsepower level. Once in, I'll give the new transmission an easy break-in - until I do decide to stick my foot to the pedal and light the tires up. What I did find, while the old transmission still worked, was the EZ EFI 2.0 Throttle Body system worked flawlessly in my purposely easy driving. With the drivetrain fixed, I'll be making timing changes and etcetera to the EZ EFI 2.0 fuel injection, and leaving my notes here in this thread. With the new transmission, I'll be using the normal lead foot driving style I had been avoiding in this truck.