My new air/fuel gauge is saying that my car is fine when it first starts up, but then goes lean as it idles or drives after a few seconds. Either I haven't gotten the float levels correct, or could it have to do with the fact that I haven't connected a vacuum hose to the EGR valve? My pressure is almost 7psi too. ------------------ 1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock... all the suspension stuff... 9-bolt posi disk is in... K&N filter... 93 octane... -=ICON Motorsports=-

Would a blown head gasket cause this to happen too?

I would try adjusting the carb first. Try richening the mixture on the high speed circuit. Also, check for vacuum leaks. My EGR has a busted diaphragm, so it caused a major vacuum leak. I didnt want to buy a new one, wo i took an aluminum can, cut it to shape, and bolted it under the EGR gasket. This way it looks like my EGR is still working for inspection reasons. My engine runs fine, too no lean or rich condition, but this is only after much carb tuning to get the mixture right.

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1983 Pontiac Firebird SE
LG4-Based Chevy 400
700R4 Tansmission
Modified 4 Barrel Q-Jet Carb
Accel Super Stock 8mm Wires
Edelbrock Pro-Flo Air Cleaner
3.23 Posi Rear
14X7" Cragar SS/T Wheels
35X4 CD/AM/FM Head Unit
100WX2 Amp
2 Pioneer 12" Subs in Custom Box
Third Gen Performance

No.

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ASE Mechanic/Machinist/Smog Tech

1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
1981 corvette
1995 Kawi ZX6R

GO #3

most likely not... unless it had a vaccum leak past the shaft (not likely)...

zroc