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Old 05-31-2012, 07:33 PM   #1
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Unhappy rough idle and stuttering help!!

hey guys,
i have a 66 mustang with a 351W. and i just got the car running again. before i pulled the engine the car would stutter and it died at stop lights if i wasnt on the gas. so i got it started today and drove it around,the tac would wobble and fluctuate at idle and when i would let off the clutch and give it gas it would stutter until i got up to about 15-20mph. what would cause this? valve adjustments? and also when i would go to start the car i would turn the key and nothing would happen (no click) and the 2nd time id turn the key the car would start. weird seeing that i replaced all the battery cables yesterday. could this be the solenoid? and all of my electrics would work when the key was in the on position...
any help would be appreciated!!
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Old 06-01-2012, 12:35 AM   #2
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Checked the timing ? Or cap and rotor ?
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Old 06-01-2012, 12:46 AM   #3
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Re: rough idle and stuttering help!!

The distributor is new (pertronix) as well as the wires no more than 50mi on em. and the timing looks off, but I was told that the harmonic balancer may have moved or rotated around the rubber (if that makes any sense) because the timing mark is all the way ontop of the balancer. I would get a new one but im
16 and jobless ha so money doesnt come easily. and the tc & gears lined right up

---------- Post added at 12:46 AM ---------- Previous post was at 12:44 AM ----------

It's the outer part of the balancer that could move around the rubber...
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Old 06-01-2012, 12:51 AM   #4
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Yeah I know what your talking about. Try to change the timing while the engine is running and try to tune it by ear?
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Old 06-01-2012, 12:54 AM   #5
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Re: rough idle and stuttering help!!

Yea that's how we got it to start haha
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Old 06-01-2012, 03:21 AM   #6
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You need a timing light bad..
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That's unimpressive
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Old 06-01-2012, 11:04 AM   #7
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Re: rough idle and stuttering help!!

We do have one that's how we saw the timing mark on top of the harmonic balancer
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Old 06-12-2012, 09:10 AM   #8
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Have you looked at a vacuum leak at all?
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Old 06-12-2012, 10:04 AM   #9
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Re: rough idle and stuttering help!!

We did and we found one and fixed it (we sealed it and re sprayed wd 40 and got no bubbles)but no real difference. We are thinking it may be an ignition problem now...
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Old 06-20-2012, 03:55 PM   #10
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what kind of carb do u have? my 66 had the same problem and it turns out the carbs idle air to fuel ratio was way off.
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