Engine Performance problem
1997 GMC C1500 V8 Four Wheel Drive Automatic 180000 miles
Just bought this truck. In the beginning it ran at 2500 rpm when idling and 1500 rpm in gear. Put it on the reader at Advance. Had a MAP sensor error and an IAC error, also cylinder five was missing. Replaced the MAP sensor and the idle air control, and plugs wires, and pcv valve. Had codes cleared and drove it home (15 miles)
Now it idles at 1800-2000 rpm and 900 rpm in gear. May still be missing but I'm unsure at this point. Checked the vacuum lines. Does seem to be one missing from a small junction (pure vacuum diag. Switch?) On the passenger side of the intake manifold. It is directly behind the alternator, has a blue plug and two vacuum lines. One goes to the can on the drivers side and the other is missing.
If more info is needed let me know. It has the 350 in it.
have the same problem?
Tuesday, July 15th, 2008 AT 7:21 PM