SOURCE: Was wondering what this diagnostic
This solution is for 1987 to 1989 Chevrolet Camaro vehicles, TPI V8s.
It's an Idle Air Control (IAC) circuit failure. The close throttle engine speed is 125 RPM above or below desired (commanded) idle speed for 45 seconds. See a dealer service department for trouble diagnosis.
SOURCE: dtc C0035,C0040, P2227,P2228 ENGINE LIGHT
The C0035 and C0040 are speed sensors trouble codes. The P2227 and P2228 are baro sensor error codes. Causes for it to go out of range are broken wires, disconnected connector, or a bad sensor. Check the voltage to the white/black wire on the connector, It should show 5V
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