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Ask Joshua Haynes Your Own Question
Joshua Haynes
Joshua Haynes,
Category: Dodge
Satisfied Customers: 256
Experience:  Lead Technician/ Manager at Precision Tune Auto Care
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Engine runs great until 2800 rpm then misfires sputters let

Customer Question

engine runs great until 2800 rpm then misfires sputters let off the runs fine
JA: Have the spark plugs been changed yet?
Customer: no it only does it while driving not while no load of driving
JA: What is the model/year of your Dodge?
Customer: 97 1500 magnum 5.9
JA: Are you fixing your Magnum yourself? What have you tried so far?
Customer: yes maiden trip yesterday
JA: Anything else you want the mechanic to know before I connect you?
Customer: speedo goes crazy while driving
Submitted: 1 month ago.
Category: Dodge
Expert:  Joshua Haynes replied 1 month ago.

Hi, my name is ***** ***** I will assist you.

Expert:  Joshua Haynes replied 1 month ago.

I have seen a lot of issues with these engines involving worn/corroded distributor cap leads with symptoms exactly like you have described wherein the engine will only misfire at high rpms...have you had the distributor cap changed or at least looked at yet? if not, I would suggest pulling it off and looking for excessive white buildup on the eight leads inside. Also, check the rotor button in the center closely for wear and black marks.