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5.3 Engine Stumble / Misfire On Hard Acceleration
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Question
splat10
99 silverado with 5.3 z71, 148k miles, and brand new tranny (condition existed both before and after tranny rebuild)
on acceleration in 1st or second gear (don't usually get 3rd gear to 3000 rpm) when i get to around 3000 rpm the engine stumbles real bad. It jerks and loses all power, resulting in a downshift. There are no signs of a misfire at any other condition and there are NO codes on my Acton scanner (don't know about the tech II, can it read codes mine can't???)
When it is stumbling there is a clicking noise coming from the engine compartment that almost sounds like it rev limiting (might be a fuel pressure reg???)
Reading some other posts here's what i've done to try and fix.
1- unplugged my electrical EGR. No improvement
2) replaced the fuel filter - seems a little better but not cured
3) New fuel pump several months ago (don't know if the problem started then or not. can't remember)
4) Plugs and wires are new about 3 years 50k miles ago. Haven't replaced them yet. The coils packs are original.
I'm leaning to fuel issues but don't know if i should start with the plugs and wires but that's $ i don't have right now with the tranny rebuild if I'm just throwing parts at it.
Should i just bring it to the dealer to scan it? Can they scan more than my cheapo scann can on the engine?
Thanks
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