immy ... 4/4/2010
1994 Buick LeSabre Custom 6 Cyl 3.80L
why do manifold turns red after running a few minutes
misfire and engine runs hot when idling after 15 minutes
Have you had your catalytic converter tested? It might be plugged. My 01 Regal with only 60,000 miles had a plugged catalytic converter. The engine ran rough, hot, and had no power. I hope this helps.