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TPI upper plenum
I got my 88 iroc from my grandfather, he was the original owner bought it brand new, now like a month ago I changed the thermostat. now taking apart the throttle body to get the the thermostat housing, i noticed very heavy carbon build up and oil residue within the throttle body and upper plenum. What could cause this, granted i know the car is 18 years old now and was taken care of but not like i would, i have look online and some service manuals but it didnt say much to the cause of it. Should I take it apart and clean it or just try and find a upper plenum piece? I know i can purchase various thottle bodies and runnes but no upper plenum piece. Any advice would help alot.
1988 Iroc Black Exterior/Grey Interior
305 TPI
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