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1991 Cadillac DeVille 4.9L Poor Idle Quality, Surge, Misfire
Posted to GM Driveability on 9/22/2004 9 Replies

weird one here, 4.9 cad dev with erratic idle quality intermitent,surges up and down runs rough,then smoothes out for 5 min or so then acts up [...] fuel pressure and volume was winin specs, ck egr operation was ok,watching scanner when happening timing is jum...

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car Vehicle Data

1991 Cadillac DeVille

VIN 1G6CD53B9M
Engine4.9 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / port
Emissionsfed
SymptomsPoor Idle Quality, Surge, Misfire
OccursIdle, Intermittently
Message Closed

car Vehicle Data

1991 Cadillac DeVille

VIN 1G6CD53B9M
Engine4.9 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / port
Emissionsfed
SymptomsPoor Idle Quality, Surge, Misfire
OccursIdle, Intermittently