1994 gmc 1500

1994 GMC TRUCK
260,000 MILES • 4 CYL • 2WD • AUTOMATIC
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JHKNIGHT404
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i have a 1994 gmc 1500 with a 4.3L V6 it started running crappy the other day and in messing with it i have found that it only runs fine in reverse, in P, N, or and forward gears it spits and sputters and backfires and dies.....any suggestions?
Aug 11, 2011 at 8:59 PM
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RASMATAZ
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Go to this links: https://www.2carpros.com/articles/engine-backfires-while-running and https://www.2carpros.com/topics/engine-performance/backfires
Aug 11, 2011 at 9:31 PM
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JHKNIGHT404
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i understand all this but why would it run fine in reverse but not in any other gear??
Aug 11, 2011 at 9:37 PM
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RASMATAZ
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Could be a problem with the transmission
Aug 11, 2011 at 9:57 PM
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JHKNIGHT404
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i don't think its the tranny its the engine lurching and spitting except when in reverse
Aug 12, 2011 at 12:37 AM
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JHKNIGHT404
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is there some sort of sensor that might cause this issue????
Aug 12, 2011 at 8:33 PM
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JHKNIGHT404
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am i going to get any help here or what?
Aug 13, 2011 at 5:09 PM
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RASMATAZ
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Try disconnecting the TCC solenoid and see what happens
Aug 13, 2011 at 6:23 PM
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JHKNIGHT404
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where is that located?
Aug 13, 2011 at 10:21 PM
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JHKNIGHT404
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doesn't make a difference...someone said to try the park neutral switch. could that make the motor run differently in different gears?
Aug 14, 2011 at 1:01 AM
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JHKNIGHT404
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where are all the gound straps on this model?
Aug 16, 2011 at 2:24 PM
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RIVERMIKERAT
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No, I don't think the park neutral switch could be the problem. The TCC should be located on the side of the transmission. There is the main ground lead from the battery to the front of the engine. There should also be another one at the rear of the engine to the bulkhead.
Sep 20, 2011 at 11:11 PM