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Help! 02 Envoy studdering/bucking/jerking

751 views 0 replies 1 participant last post by  Sssigning 
#1 ·
2002 Envoy 4.2
225,000 miles

Parts Replaced
New tranny 18 months ago
Water pump
Fan clutch
Oil pressure sensor
Iat
Map
ECT
New plugs and coils
New starter and battery
Fuel pump and filter
New upstream O2
New throttle body
New FPR
New evap purge valve
New FL ball joints, hub

Vacuum test does 20 hg. Perfect
Fuel pressure 55. Perfect

Now the issue: P0300 and heavy bucking at idle or accelerating.
90% of the time this is happening.
Fuel smell at exhaust.
Any suggestions would be appreciated.
 
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