I got a 4.3 L 1995 GMC Jimmy, and lately i have noticed problems with my car. When in park and ideling in drive, the rpm's fluctuate a lot and the engine misses. Also, when driving on a highway at about 60 mph, I notice the same problems. I have recently removed the EGR valve, cleaned it out and replaced it; that did not work. Next I bought spark plugs and replaced them all, still that did not solve the problem. Also, I scanned it with the ODB II and I got the message "scan successful, no problem codes available"
14,000 miles ago, i had the same kind of problems so I replaced the fuel injector and that solved the problem. It ran good until now. Any responses would be greatly appreciated. Thank You.- posted
18 years ago