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My buddies lightning with a stock motor and a 10psi S-trim on it seems to be doggy sometimes like it has severly retarded timing and then the next stoplight it might run great.
He has an A/F ratio monitor in cab and it is always hanging out in severe lean condition now, even when running boost and 100psi fuel pressure.
It also has a rough idle condition sometimes it will flucuate between 300-1000rpm normally it idles at around 750 rpm.
Could this be the o2 sensor?
If anybody has any ideas that would be great we are out of them
Sounds like a bad ground to me. I'd check the fuel pressure regulator too, and then put in 2 O2 sensors (one for his gauge, and one for the computer). It's possible that the computer is not gettin enough signal from the O2 sensor, or feedback from the gauge.
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1996 F150 Regular cab, SWB, 4.9. 5speed.
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