What causes my car to, when it reaches 25 mph and 40 mph, respectively, to jerk and also the rpm is high?

2001 SATURN SL2
105,000 MILES
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ESTELLE MASSIAH
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My car labor before it reaches 25mph, is at very high rpm and then it jerks, rpm goes dowm a bit jerk again when it reaches 40 mph and rpm is high again.
Mar 30, 2012 at 5:37 PM
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RASMATAZ
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Check the fuel pressure if its within specs -start here
Mar 30, 2012 at 6:11 PM
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SATURNTECH9
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Just to add to this one does it only jerk when shifting or while acellerating?Any codes in the computer?
Mar 31, 2012 at 1:20 AM
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ESTELLE MASSIAH
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Thanks for your prompt response. Only when shifting and accellerating.
Apr 3, 2012 at 4:58 PM
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SATURNTECH9
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So does it feel like the transmission is slipping?Or the engine is cutting out?If the engine is cutting out i would check the spark plug wires first also the spark plugs.Make sure there isnt platnuim plugs in the engine.They carbon foul in those engines you want stock copper plugs i recomend the ngks like it came with.Also any codes in the computer?Have you checked for codes?Also is the jerking worse with the a/c on if the a/c works?
Apr 3, 2012 at 5:18 PM