I need input from people who have had this sort of problem. EZ-EFI system WAS working properly, then suddenly goes to hell. This seems to indicate to me that there was nothing wrong with the installation - you wouldn't have gotten out of the garage to start with - right? Did you finally FIX the problem and what was it? In short, what "broke"? With my install (a 2-injector Jeep kit), everything went pretty much “textbook” with installation and Initial Start. After the handheld settings, it made it all the way through the Setup procedure, warming of engine, setting the throttle blades, recalibrating the TPS etc. I made it right up to the “Setup Complete - Drive so it can Learn” part of the procedure. I hit the streets, impressed with how it felt right out of the garage – very promising – with a big smile. Everything is working as I had read about by those people who had no issues. I get 5 BLOCKS AWAY, the engine stops responding to throttle, starts chugging and dies on the side of the road. Could not restart engine. I get towed home. Engine was flooded to the point where I had to change the oil before trying again. Another Reset and Restart. Rich and flooding right off the bat and fouling of spark plugs in minutes. As per Tech’s request, I recheck every aspect of the installation, check harness, all the parts, test every sensor of the system and wasted 2 weeks going in circles looking for “interference”. FOUND NOTHING – but installed a new MSD module in my HEI distributor anyway to use the module’s Tach output and do away with the RPM module (FAST includes it but basically tells you to avoid using it if possible, recommending MSD products instead). This module provides a 12 volt square wave, 20° tachometer signal that will trigger most tachometers - and is exactly what the EZ-EFI requires. The MSD module didn’t make any difference at all when we tried going through the Setup procedure again. Still flooding But we did observe that the ECU has the injectors shooting fuel like a firehose even while cranking the engine. I tried an experiment by selecting “Other” under system and discovered something interesting if I lie to the system and tell it I have 2 – 200# injectors @ 65psi fuel pressure (reality is 2 - 88# @ 43psi). With these BS settings IT RUNS AS IT SHOULD. IRMs are 00 – as in Zero-Zero. All other "Live Data" reads what it should be. This is the closest it gets to running properly as it initially did. ECU and everything had been RMA’d back to FAST for testing and got "good news". There was nothing wrong with the ECU, handheld, communication cable, O2 sensor and throttle body. Even the injectors tested fine on the flow bench. (I didn't send the harness - maybe the problem?) So it appears, I may fall into that category where "there's nothing wrong - but your car won't run right." I'm wondering what changed during my 5 block drive It certainly didn't rearrange the location of the wiring harness. Or add an new electrical component to cause interference. Maybe a short in the harness? (of course, the one thing NOT sent to FAST for checking). Maybe I'll just have tell it I have 2 – 200# injectors @ 65psi fuel pressure. It seems more than happy to run that way. I do see that everyone who does manage to solve a problem is happy in the end. I WANT TO BE ONE OF THEM.