misfire at high rpm

musclemike · September 12th, 2007, 02:17 PM

hey guys looking for some help on this one.. asked around alot allready but to no luck. anyways ive got an 85 GT 5.0 bored out .030", performer rpm cam fully adjustable roller rockers, air gap intake, 4barrel 650cfm edelbrock carb, shorty headers, vortex exhaust.. on full trottle it pulls hard but once i get to 4800rpm- 5300rpm it misfires like crazy. if i stay on the throttle it will clear out and pull 6000rpm.. any thoughts would be greatly appreciated.

Thanks Mike Pasman

dapack69 · September 12th, 2007, 02:19 PM

Could that be where the secondaries are opening up?

ryans88gt · September 12th, 2007, 02:23 PM

Sounds like too much fuel. Check you secondary jets and maybe go down a few steps... better yet toss that edelbrock carb and get a real one.

September 12th, 2007, 02:17 PM	#1
musclemike Look Ma! My First Post! Join Date: Sep 2007 Posts: 1	misfire at high rpm hey guys looking for some help on this one.. asked around alot allready but to no luck. anyways ive got an 85 GT 5.0 bored out .030", performer rpm cam fully adjustable roller rockers, air gap intake, 4barrel 650cfm edelbrock carb, shorty headers, vortex exhaust.. on full trottle it pulls hard but once i get to 4800rpm- 5300rpm it misfires like crazy. if i stay on the throttle it will clear out and pull 6000rpm.. any thoughts would be greatly appreciated. Thanks Mike Pasman

September 12th, 2007, 02:19 PM	#2
dapack69 Enthusiast Join Date: Nov 2006 Location: Ft Walton Bch, FL Posts: 505	Could that be where the secondaries are opening up? __________________ Custom engine built from Super Six, Cam from Delk performance, Custom Novi 2000 in the works. My Car www.supersixmotorsports.com www.bc-automotive.com/

September 12th, 2007, 02:23 PM	#3
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 3,453	Sounds like too much fuel. Check you secondary jets and maybe go down a few steps... better yet toss that edelbrock carb and get a real one. __________________ 89 LX 515 hp 497 ftlbs 88 GT 11.4 @ 118

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