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Jerry, Master Mechanic
Category: Dodge
Satisfied Customers: 1704
Experience:  ASE Master tech, 30 years exp. troubleshooter, driveability tech
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Speedometer jerks from 20 to 40( after driving for 10

Customer Question

Speedometer jerks from 20 to 40( after driving for 10 minutes ) and transmission lurching
JA: What is the model of your '10 Dodge?
Customer: 2003 grand caravan
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: I haven't tried anything yet. Just before this happened I added some fuel additive as engine was having trouble starting and running rough. .It seems to have sensor problems each time I add a can of seafoam...
JA: Have you metered out the ignition system?
Customer: No. I was just going to send it to the repair shop and was wondering how bad it might be and if I should park it until next week when the shop sees it.
JA: Anything else you think the mechanic should know?
Customer: No
Submitted: 2 months ago.
Category: Dodge
Expert:  -Brad- replied 2 months ago.

Good afternoon and welcome to JustAnswer!!

My name is ***** ***** I have worked for a Chrysler-Dodge-Jeep dealership for 19 years and I will do my best to help.

Is the check engine light on and if yes then can you post the codes here?