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85 buick somerset regal

mcgrnr0013

Buick Newbie
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Buick Ownership
Buick
Someone please help, I've tried everything. I've got a 85 buick somerset with the 2.5l tech4 engine, the engine is a remanufactured engine and only has 15k liles on it since its been swapped. My problem Is the vehicle has a high idle like 1800 or 1900rpms without ac on and with ac its around 1100 or 1200. Hard to tell exactly with digital dash. And also while I am driving and the vehicle is warmed up it has a misfire with I give it very light throttle and am cruising, to maintain speed. When I let off the throttle it smooths out and when I floor it, it smooths out, I have no other drivability issues. Only a high idle and god awful misfire when I try to maintain speed
 
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