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Q: on this car it runs great, but now and then it will not run at low RPM's on 2003 Chevrolet Monte Carlo

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
it will all the sudden not run at low rpm;s but if you hold gas peddle about 3/4 down it will run. then if you drive it fast over 70 mph at the higher rpm it will stop doing its problem. there are no check engine lights on or code. fuel presser is fine. can't fugue out. the why it will do is not run low idle and then after a very fast drive go away still no check engine lights or any thing. HELP!!!!!
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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