Have replaced wires, plugs, MAS,heat sensors, camshaft positioning, coil, fuel filter,distributer cap and button and I still have rough idle and surging, strong gas smell at startup. have had computer say random misfire. found cracked #6 plug and replaced. ran good for a month then started again worse. ran high octane gases and fuel system cleaners. no improvement.
Timing problem??
SOURCE: 1997 GMC TRUCK IS MISSING AT ACCELERATION
timing chain is streched replace chain and gear set
SOURCE: 1992 gmc chevy 350 wont idle when warm
This could be a number of things but i think that your problem sounds like a vacuum leak or an EGR problem. Try listening for leaks and try un-plugging the EGR solenoid valve one time.
SOURCE: 1994 gmc safair 4.3 wont run at idle and bad
Is the "service engine" light on at all?
If so, what codes are present.
Have you checked the EGR valve. If the valve is stuck, the engine will idle very poorly. You can remove it and clean the carbon deposites and make sure it moves freely.
The EVAP purge solenoid will also cause an idle problem but should show up as a service engine light problem.
Let me know.
Regards,
SOURCE: 2000 gmc jimmy 4.3L misfire on cyl 4 and cyl 5 at
Clean the egr valve which would cause rough ideling and misfire........Hope this helps u out.
P0316 crankshaft position sensor, camshaft position sensor, or a wiring issue. Since this code indicates a start up misfire, pay attention to items which may expand or contract when cold (if the code sets when the engine is cold), or hot (if the code sets on a hot restart).
If you have other misfire codes that pertain to individual cylinders, you should attend to them first P1151 has a huge list of things that it can be, But included in that list is the camshaft position sensor , po1131 is the same thing, all building up to your car is running lean , so I'd do the sensor (cam) and check timing,,
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