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I ended up being able to borrow a fuel pressure tester today and I tested the car, KOEO the readings were at 53psi. and with the engine at idle the readings were at 46psi. If I'm not mistaken these...

The weather was about the same, I was wondering if I did something wrong in my tune so I did put the factory tune back into the car and it still has the LTFT problems. If I can get my hands on a...

I guess it does take about 3 seconds or so to start, but as long as I've had it, it always has, and the fuel trims were never as goofy as they are now. Fuel pressure regulator is a good guess though,...

I know what you mean about these PCMs, I have a 1999 GMC Sierra late model with the 4.8 V8 and it sure seems a lot more tuner friendly. This car is getting the better of me though, I can't really pin...

Alright, thanks. I think I'm gonna dig into the thermostat deal and see what I come up with. My last question with the thermostat would be if running a 160 will harm the engine at all? I'm not too...

Thank you for the feedback, After work today I logged the car again as is just for the heck of it, and the fuel trims seemed to be even a little more off than before, and at WOT the LTFTs went to...

I have an 2000 F-body with the series II 3800, and just to check up on the car I scanned it for a while and found the LTFTs to be a bit leaner than I'd like to see at idle, and under some throttle...