code 22 only at idle

i have a 95 tahoe 5.7 with 100 k miles. at idle my check engine soon light comes on then goes off once i start moving again. the code is 22. thw throttle position sensor. i checked the sensor with an ohm reader and it checked ok. what could be my problem.

Ohm meter is the wrong way to go. Check TPS voltage key on engine off. I believe the signal wire is blue, but the easy way to find out is unplug the TPS. Check each wire. One will be close to 5 volts. Turn off the key check the other two with the ohm meter. The one closest to 0 or infinity is ground, the other is the signal wire. Plug the connector back to the TPS. Turn the key on. Voltage at signal wire should be around .5-.6 volt. If you or someone else has readjusted the idle lower to compensate for vacuum leak (throttle body gasket), the minimum TPS voltage may be too low.

Check the TPS voltage output at closed throttle-I think it should be app. .5 volts at idle and 4.5V at WOT. Resistance readings [ohms] are not always accurate due to temp. changes,etc.

well i know for a fact its not the tps because i also bought a new one and still had the same problem. and i also reset the computer after i installed it

brooster-just to help with the diagnostic on this-"the wire that reads 0 or infinity is the ground"-not causing trouble,but that seems to be a opposing statement. 0 ohms is a perfect connection,while infinity means no connection.Agree with the restof the diagnosis

Depends on which ohmeter you are using