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i have a 92 and a 94 sedan.....92 have 176k and 94 have 136k miles.....on a cold day in the morning....i start my car and let it sit there for a while to warm up.....then the engine start reving up and down around 1 to 1.5 thousand RPM.....is that suppose to be normal ?...what causes it ?...how do i fix it ?
thanks
thanks