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Rpm..jumping..the car is idling over 1 then back below 1 instantly

Answered by:Virtual Wrench (L J)
Master Mechanic
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Customer Question

My car is not idling right. The rpm keep jumping up and down. When stop the car is idling over 1 then back below 1 instantly. When I step on the gas, the car starts to jerk and it does not shift into the next gear right away, the rpm goes up passed 5 then it shifts. What is wrong?

Optional Information:
1998 Chevrolet Cavalier 2.2

Already Tried:
nothing

Submitted: 2365 days and 12 hours ago.

Category: Car

Value: $15

Status: CLOSED

Expert: Virtual Wrench (L J) replied2365 days and 12 hours ago.

Did this problem just start? Or has it been acting up slowly?

Customer replied2364 days and 11 hours ago.

Reply to Virtual Wrench's Post: it just started39051.4704177083

Expert: Virtual Wrench (L J) replied2364 days and 11 hours ago.

It sounds like there is a vacuum leak causing both the idle flucuating and the late shifting. You will need to look around in the engine area for any small hoses that may have come disconnected. If you can't find any, then you will probably be better off to take it into the shop for an acurate diagnoses. I don't think it is anything major, just might be a little tough to find.

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Thanks for asking!

V W

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