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92 Cutlass Supreme 3.4 dohc . engine 199k miles xmission 100k miles. Engine starts and idles fine .Runs at highway speed ok . Shows egr code when letting off gas at highway speeds but has done that for 5 or 6 years and never had any problems before . When driving at low speed around 25 mph and let off gas , idle surges up and down approx. 1000 rpm for 3 or 4 times then returns to normal . Doesn`t do this all the time . Any ideas what is causing this ? Thanks for any Help
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maybe your egr has a leak to the outside air.If you aren't friends with a liar, you aren't friends with anyone. -
yeah possible vaccum leaksigpic
1993 Cavalier Z24, 3.1/3400 hybrid, crane 272 cam, LS6 springs,port and polish,2.5 exhaust to 80 series flowmaster,solid mountsComment
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yeah if the egr is leaking or failing it will mess with it.... but that much of a shift in RPM makes me think intake leak... maybe thru the EGR Like said above.Comment
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