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1990 Celica GTS
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Get throttle body clean. Remove the intake pipe on the Throttle Body. Remove TB if you could. Spray the cleaner into the TB and any hole you can see in the TB. The IAC holes are at the bottom of TB. Spray in there and let it seat for a minute. Remove small rubber hose on the TB ONE AT A TIME and spray into TB through the pipe. Put the hose back before you go to next. This whay you won't mix them up. Spray on the anything that looks black/brown untill they're clean. A tooth brush and some rubbing will help. Spray into the manifold also. Start the engine and spray short blast into TB. Engine will try to stall just spray slowly so it doesn't. Keep spraying into the bottom holes until whole can is gonna. Put everything back and adjust idle and timing. Also remove EFI fuse or battery +ve to reset ECU. I got a few old IAC so don't pay $300 for a new one ;)
 
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