Hey guys, I've been having some weird tuning issues with my sportsman. So looking over logs I started noticing what looked like possible electrical noise. Im already running resistor plugs, Magnecore plug wires, all wiring is far away from existing high voltage wires. First thing I noticed was on my TPS % dash it was always reading 004% at idle no matter how many times I calibrated it. As a test I temporarily grounded the ECU to the body and presto!! my idle TPS % reads 000 at idle every time, and ramps up normally. So I went further with the testing as I was also seeing AE fuel adding when I felt there shouldn't be any adding. I removed the alternator belt only and fired up the car. First thing I noticed was my idle AFR actual was lean, but upon a few short revs in neutral it revved up much cleaner and there actually weren't any AE blips on the log. So I guess my question is, is this a clear indicator the alternator is causing an issue? Or is there something in this test that Im overlooking that could explain the results I saw? I attached screen shots of both, with alternator belt on and without. Also just to add... I have the battery grounded to the block with a heavy cable, the block is grounded to the frame with a ground strap, the block is also grounded to the firewall with a ground strap. The alternator in question is a powermaster 150amp (1-wire) alternator.