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Engine jumping and RPM

Tiny
DODGERAM150098
  • MEMBER
  • 1998 DODGE RAM
  • V8
  • 4WD
  • AUTOMATIC
  • 200,234 MILES
My truck cranks fine goes for about five minutes then it starts jumping and the rpm hand is jumping up and down. It is not loosing much power when it does it, but most time I turn the air conditioner on it stops doing it. Now it is getting to where it will not stop.
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Sunday, October 21st, 2018 AT 9:09 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,958 POSTS
Hello,

This happens when the ignition system voltage is back feeding into the tachometer circuit. I would start by replacing the spark plugs and wires with OEM parts. Here is a guide to help you get started. Service the throttle bore as well.

https://www.2carpros.com/articles/how-to-tune-up-a-car-engine

Please let us know what happens.

Cheers, Ken

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Tuesday, October 23rd, 2018 AT 10:37 AM

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