stumbles on acceleration - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

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post #1 of 5 (permalink) Old Jul 28th, 02, 10:03 AM Thread Starter
Join Date: Mar 2002
Location: berkeley, ca
Posts: 27
even in park/neutral, when I jump on the gas, the egine hesitates and stumbles before taking off. it idles OK before that.

I have a 67 vert, new crate 350 FB385 and a speed demon 650.

Any ideas?
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post #2 of 5 (permalink) Old Jul 28th, 02, 10:14 AM
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Join Date: May 2001
Location: Houston, Texas
Posts: 4,491
The Speed Demon carb, adjust all 4 idle mixture screws out equally to 1 1/4 turns.

Test drive, if it stumbles, try backing them out another 1/4 turn or so...if that doesn't work go the other way...I've found they are sensitive to that, and will cause hesitation.

Don~ ZZ430DropTop
70 RS/Z28
67 RS/SS Convertible, 70 RS/Z28
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post #3 of 5 (permalink) Old Jul 29th, 02, 04:48 PM
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Join Date: Mar 2002
Location: Lomita, CA USA
Posts: 348
I'm in no way an expert here... by my 327/210 factory stock 1969 had the same problem. I changed my dirty air filter and now she drives like a dream again.
post #4 of 5 (permalink) Old Jul 30th, 02, 03:06 AM
Join Date: Oct 2001
Posts: 233
I was having the same problem with my 750 holley. Check to see if you have a steady stream of fuel going in every time you give it gas. I adjusted my floaters a little higher and it went away. What I did is went and found a road nobody uses. I then stopmed it to see how to adjust the floats. And went up quater turns on the front and back. Then stopmed it again then adjusted and did this till I got it to work the way I wanted to. For some reason when I adjust the float levels to be under the sight hole it runs crappy. See my post on engine and drivetrain section.

1979 - 305ci
Holley 750cfm Vacuum Sec.
Edelbrock Performer Intake
Summit 48,000 volt Coil

[This message has been edited by 4U 2 NV (edited 07-30-2002).]
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post #5 of 5 (permalink) Old Aug 1st, 02, 08:14 AM
Join Date: May 2002
Posts: 140
Forget the carb brother. I had this problem in mine. I thought the car was dead. Until I checked the timing properly. You won't be sorry.

1978 Z28 350 4 speed 3:73's.
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