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Old December 12th, 2014, 09:15 PM   #1
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cwebb's Avatar
Join Date: Feb 2007
Location: covington, ga
Age: 48
Posts: 35
Default Car idles in gear but surges

I have been working on my tune on my 1988 Mustang and got it to idle in gear somewhat. The problem now is it wants to surge really bad in gear. Its like it wants to surge forward with the lope of the cam. The engine idles its best the lower I put the base timing. I am down to 10 degrees. It actually ran at 5 degrees but throttle response wasn't as good. I played with the timing table and fuel table but can't get rid of this surging in gear issue. Checked all vacuum lines and even unhooked them (all but fuel regulator and map sensor)to eliminate a vacuum leak. I will get a data log of car running in and out of gear this weekend.
Anybody have any suggestions as to which direction to go ?

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