1990 Chevy Corvette rough idle

1990 CHEVROLET CORVETTE

175,000 MILES • V8 • 2WD • AUTOMATIC

BOBBY ROGERS

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I have a 1990 corvette with 175,000 miles that has a rough idle after warming up. It acts like it is misfiring or runnings on 7 cylinders. I have changed plugs wires dist cap and rotor. It will surge and not hold a steady speed with the cruise control on. I have just replaced the throttle positioning sensor... and had the vacuum lines to EGR cleaned and checked all are now OK. When the engine warms up it acts just like it did before all this... Any ideas???

Dec 17, 2008 at 3:08 PM

FMC1956

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2 POSTS

[quote:5300049954="bobby rogers"]Engine Performance problem
1990 Chevy Corvette V8 Two Wheel Drive Automatic 175000 miles

I have a 1990 corvette with 175,000 miles that has a rough idle after warming up. It acts like it is misfiring or runnings on 7 cylinders. I have changed plugs wires dist cap and rotor. It will surge and not hold a steady speed with the cruise control on. I have just replaced the throttle positioning sensor... and had the vacuum lines to EGR cleaned and checked all are now OK. When the engine warms up it acts just like it did before all this... Any ideas???[/quote:5300049954]

Mar 5, 2009 at 10:12 PM