My car starts and runs fine in the morning. after warms up the idle drops intermittently fromn about 700 to 500 rpm and the oil light comes on? if I rev the gas increasing the rpm the engine light goes off. any ideas??? I also just changed the engine in this vehicle with a used 80000 miles one because mine was 220000 and leaking ect... had problem before I vhanged engine too???

 

Engine idle speed is controlled by the PCM which controls it via the idle air control motor. The oil light is a known problem with 2.7L engine (don't know what engine you have). Replacing the oil light switch is a cheap way to deal with the problem and might solve it. If not, you may have real oil pressure problems.

 

mine is a 2.5L 1996 model.

 

Replacing the oil light switch is a cheap way to deal with the problem and might solve it. If not, you may have real oil pressure problems.