99 gmc sierra z71

Asked by Jan 08, 2017 at 06:41 PM about the 1999 GMC Sierra 1500

Question type: Maintenance & Repair

My 99 gmc has a 5.3 it wont rev over 3000 rpms. It
did idle ruff but idles fine now after i have replaced
intake gaskets, fuel pressure regulator, tpi sensor,
egr tube, complete tune up plus changed coil
packs. It has a check engine light on and the cpu
wont scan or reset and the fuses are good cigar
lighters all work! Grounds are all good, plus i just
cleaned the maf sensor and idle sensor

3 Answers

73,065

Are there any codes?

73,065

I am suspecting the Throttle Positioning Sensor and wire harness plugin.

73,065

You would have a p1515 to 1519 code come up, I suspect it would be p1516

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