Classic Engine Tech 1967 - 1981 Engine Related

help with misfiring

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Old

Apr 25, 2006 | 05:36 PM

#1

batmb13

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Joined: Mar 2006

Posts: 20

help with misfiring

i have a 350 with a 750 holley carb on it. when i gun it it misfires past 4500 rpms and then as soon as i let off it backfires. is this to lean or to rich of a mixture.

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Old

Apr 25, 2006 | 06:17 PM

#2

spinout

Registered User

Joined: Oct 2003

Posts: 156

Re: help with misfiring

first do you have an exaust leak anywhere
second how about some info on the motor
could be a number of things
high k motor it could be cam
exaust leak
valve adjustment
spark plugs, wires,cap and rotor
coil ???

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Old

Apr 25, 2006 | 06:40 PM

#3

batmb13

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Joined: Mar 2006

Posts: 20

Re: help with misfiring

i do have an exhuast leak. my headers do not seat well and there is a little leak on the drivers side.

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Old

Apr 27, 2006 | 04:55 PM

#4

84firebird

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Joined: Nov 2005

Posts: 268

From: WI

Re: help with misfiring

what i'd look at is timing, shoot a timing light at it and see what it looks like. and next, the coil might be worthless

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Old

May 2, 2006 | 10:45 AM

#5

stale

Registered User

Joined: Nov 2001

Posts: 338

From: Clearwater, FL

Re: help with misfiring

That 750 Holley, unless it's toast, should easily feed that 350 up to the redline. Check the coil and wires.

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