2001 Mitsubishi Diamante runs rough

[jj4475 10+ year member]

Hello, my car is running real rough while in neutral and while driving. Its rough when I put in into park and reverse. Just wondering if anyone knows about this car. Car has 68k on it. Thanks

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[mk_ 10+ year member]

Last time you replaced your plugs/wires/coils?

 

[jj4475 10+ year member]

Im not sure I never have only had car few months... But this thing runs real rough you know think its something more serious

 

[mk_ 10+ year member]

Basic tune-up would be the place to start. If it doesn't help any, atleast you know where you stand in your routine maintenance.

 

[prophecy 10+ year member]

Is the check engine light on if so have someone scan it and get the codes. I would start with a tune up as well or could possibly be a vacuum leak. Open the hood listen to see if you hear hissing. You would be surprised how much a small vacuum leak can effect the idling.

 

[I Like Waffle]

Vacuum leak. On those small import shit motors it can really hurt them as alot of shit is controlled through vacuum pressure.

 

[mk_ 10+ year member]

I would have to agree with the two gentlemen above. Good luck.

 

[Rich B 5,000+ posts]

I had a rough idle on my 01 Eclipse for a year after I bought used in 2007, checked the vac lines, replaced spark plugs (with Iridium), cleaned the MAS, cleaned the throttle body, and nothing seemed to help.

I finally gave up and was considering new coil packs when I looked at the plug wires real closely and I saw a tiny hairline cracks on two plug boots.

Replaced those two wires (at $18 ea...what a ripoff!) and the rough idle is gone.