Hi I have a 99' galant vr4. My car has developed a problem after I gave the throttle body, IACV (throttle body cleaner) and MAF sensor (CRC MAFS cleaner) a clean. The car was driving fine before the clean, the reason for cleaning was the rev seems to drop very slowly after I rev the engine in neutral (no biggie but I thought I could make it run better).
After the cleaning the car seems to be idling and rev'ing fine in neutral whether engine is cold or warm. The problem only arises when I put it in gear. The car will shake, idle at about 600 rpm (much lower than usual), CEL comes on and thick smoke from tailpipe and exhaust manifold. Strong smell of unburnt gas.
Prior to cleaning out the throttle body, IACV and MAF I changed the transmission oil and transfer case oil. Took it for a drive after changing fluids and seems to drive fine so I doubt this is the cause.
Any help is appreciated.