4.3 GMC Sierra engine

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4.3 GMC engine starts good idles perfect have checked it on scanner 3 times and it says everything is working fine shows no codes catalytic converters have been repaired new fuel pump and filter,EGR valve is good fuel body is good , have had it to the garage 6 times with no change in results above 1500 she coughs through the air chamber and fuel body. would anyone please help me

Nov 9th, 2013
this sound like back fair if its an old 4.3 could be wrong firing order bad fuel mixer if new 4.3 could be burnt or bind valves crack intake manifold .if you need more help i need more info what year and model is it 4.3 vortec engine etc
Nov 9th, 2013
its a 2000 GMC sierra 268000 km
Nov 9th, 2013
yes its a 4.3 vortec engine
Nov 9th, 2013

i think its a Spider Injector is leaking  you can check by take the upper intake off look  for fuel in there . spider.jpg 

Nov 9th, 2013

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Nov 9th, 2013
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Nov 9th, 2013
Dec 6th, 2016
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