004 Mazda 6 when driving over 60 mph or in cruise on highway it jerks when

  • Thread starter Thread starter jakenjennasmom
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jakenjennasmom

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downshifting.? Not a bad jerking but noticiable. I put it in manual to see if it would downshift better that way and it still jerked and acted like it didn't want to do it. Also when taking your foot off the accellorator when driving down a road the rpm gage thingy goes all the way down and then back up. When starting my car in the morning it idles really high sometimes. Also we did take it to autozone and they hooked it up to the computer thing. It didn't throw any codes out. What could it be. A censor? The transmission? All fluid levels are good. Also the check engine light stays on for a few days and then will go off. Can anyone help???
 
my saturn does the same thing you may need exaust work turns out i had a hole in the mantifold by the engine fixed that it worked great
 
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