DeTomaso Mailing List: April 1997, Message #119
     



From: pantera@pobox.com (David Doddek)

Subject: Re: Carb Question

Date: Tue, 15 Apr 1997 22:11:09 -0500



Take a couple of plugs out and inspect them.  If they are black then the

misfire is caused by a rich mixture and you should be getting bad mileage.

If they are very white, then you are lean (what I expect) and you will be

getting fairly good mileage.  You could probably just open up the idle

mixture screws by about 1/2 turn adn it will work OK.



Dave



>I have a 384 cu in engine with roller cam etc. and a Holley 750 carb (double

>pumper). I am at altitude (5500 ft, low humidty,in Albuquerque, NM) and the

>car under power works great. Who needs a race track out here!!

>

>When I am in cruise, I get barely noticable, power fluctuations, with no

>change in engine RPM. I think it is the power valve, but I have a "25" power

>valve in it, and as far as I know it is the stiffest one Holley makes.

>

>Any ideas?

>

>Greg Sullivan

>

>1980 GTS/Group 4     1995 Tahoe    1970 LT-1 Corvette Conv

>

>

David Doddek     pantera@pobox.com    www.pobox.com/~pantera    217-422-3722

69 EFI Fairlane, 89 T-bird SC, 74 Twin turbo NOS EFI Pantera (I like to go fast)