• Tiny
  • Anonymous
  • 1996 GMC Safari
  • 21,100 miles

4.3 has idle issue. Rough idle/shake in gear. First symptoms were only when a/c on. Now most of the time, but much worse with a/c on. Load from steering pump has no effect on idle. Always starts and drives fine, runs best cold after sitting all nite with a/c off. Once a/c is turned on it will idle poorly for rest of day, a/c on or off and mileage can drop as low as 8 to 10 mpg in traffic. New plugs-wires-cap-rotor IAC valve, MAF, map, tps engine temp and o2 sensors Recent fuel pump and pressurized fuel system cleaning. HELP?

Friday, October 26th, 2012 AT 2:11 AM

1 Reply

  • Tiny
  • rasmataz
  • Member

Have you checked the fuel pressure if its within specs if not do so take the readings and comeback with it-Scan the computer for code/s-we start here

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Friday, October 26th, 2012 AT 9:55 AM

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