1996 c1500 4.3 liter with manual bucks and jerks at low rmps

70

Asked by Apr 12, 2017 at 07:35 PM about the 1996 GMC Sierra 1500 C1500 SL Extended Cab SB

Question type: Maintenance & Repair

Have 96 c1500 4.3 liter and when it's idling
you can smell gas commimg out exhaust
and truck acts like it's missing but when you
rev it up or put load on motor and it
disappears and somtimes it doesn't even act
up at all have changed distributor cap , rotor
button, plugs, plug wires,  cleaned egr valve
and replace gasket, changed ignition coil
and module, changed both ground straps
one from motor to frame and frame to truck
body and it shown codes for low voltage at
Maf sensor and something about camshaft
sensor so replaced both and computer still
shows those codes and exhaust has no cats
and is dual exhaust but shop did put o2
sensors back in pipe truck gets horrible gas
mileage and when you stop on it some black
smoke comes out driver side more than
passenger side plz help me idk what else to
do does anybody have a online version off
manual that I could down load done spent
$500 and nothing has changed and like I
said sometimes it don't skip but it skips
mostly but there are times it runs like it
suppose to tho

1 Answer

87,045

It is running rich, and it may be because you don't have the catalytic converters on there. The exhaust is more free flowing, the O2 sensors are say to add more gas. I think the O2 sensors are not working properly without the cats.

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