Having problems with your 1994 GMC Sierra ?
1994 GMC Sierra Pick 4.3 V6 is jerking while driving and tac is bouncing
This is usually caused by a spark plug not sparking. It could be a spark plug, a spark plug wire, or low compression on 1 cylinder. Your check engine light should be on. You can take it to Autozone and have them put it on their scanner and the diagnostic printout will tell you where the mis-fire is at. You can also usually see spark at night time with the hood open in the dark, if it is a spark plug wire.
Repair Help & Product Troubleshooting for 1994 GMC Sierra
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