alright i recently picked up a 94 lt1 6 speed, it has a miss when it is warm at low rpms but if you step on it it clears out, the guy i bought it off of said fuel pump but theres two issues with that 1.) i tested fuel pressure and it shot straight to 41 psi and held 2.) if i step on it it clears out a fuel pump would make it die right? i changed plugs and wires and put both bank 1 #1 02 sensors in it, it will shoot a code after it is run for about a half hour and it runs great when the light is on, but the light doesnt stay on long, im lost any ideas? thanks

 

the car is trying to tell you whats wrong. have it scanned for codes. let us know what comes up. could be a number of things and to try and do all will cost big bucks.

 

That is what mine was doing awhile back. I let it go for awhile since I kept trying to find the source of the problem. Eventually it got worse and would 'miss' or buck throughout all rpm ranges. Turns out, after numerous sensor checks etc, that the culprit was my opti. I got the opti off and opened up and there was fluid and burnt residue from dried up fluids all over the opti and the cam sensor. So to me, it seems very similar and will prob get worse the longer you let it go. Mine wasn't drivable once it started getting worse, for fear of breaking something. New opti, new wires, new plugs, all is perfect now.

 

Chances are if you have a miss at low RPM you also have a miss at high RPM. The higher RPM mask the miss, but it is still there. Try hooking up an OBDI scanner and see what the code is when the lamp lights.

 

thanks guys, i have an obd1 scanner i just can never get it to shoot the code when i have it hooked up the code comes on for a very short time

 

ses light does not need to be on to get codes. 94 is a odd year and not all scanners will work with it. what scanner you useing.

 

i have a gm scanner in my paps shop, im more familiar with obd2 but he said it beeps and flashes, he uses it on his 94 blazer, ive also been getting awful gas mileage, now i know its a v8 but im talking 8-10 mpg average, and when it shoots the code the car runs fine

 

you should be in the 20 to 25 mpg range. is the scanner a tech 1

 

yeah my gas mileage is way down, and im not sure on the scanner like i said im more familiar with obdII, but i went ahead and ordered an opti if i try it and it doesnt work then at least ill have a new opti in it

 

do the vent mod on the opti. ill see if i can find it. be right back