I have a 99 Tahoe and I am trying to figure out a loss of power and loss of mpg. Bank 1 LTFT about 0 and Bank 2 LTFT approx. -10 and the STFT Bank 1 & 2 were also approx. 0 after days of driving. I measured fuel pressure and my key on engine off was 54psi and idle was 48psi. I then let it sit to...
I had something similar happen to me on my 00 Silverado. It involved the ABS light, Tach and Speedo, odometer and I believe the Check Engine light.
It ended up being oxidation on the positive terminal of the battery. I cleaned it and everything went back to normal.
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