90 gsx problem questions

[idahos_dirty_D]

so i just picked up a 90 gsx awd turbo. it has a 3 inch downpipe and 3 inch cat back exhuast. other than that all stock. it has a really rough idle and is gettin really bad gas millage it will kill a 1/4 take of gas driving to work and back which is a 15 mile round trip and its on the highway so not much stop and go. the idle will vary. it will idle at about 400-500 sounding like its running on 2 cylinders but once u give it gas it runs great. other time it will idle at about 800 and sound like its running on 3 cylinders. when your driving it around it runs very good. i started with the fuel system new filter and i put in a walbro 255 that it came with. it had really bad gas in it so i thought that that would be a start. than checked for vacuum leaks found a couple fixed them but no change. sprayed around the intake and hit a spot around the injector and the intake to the head. i have a new intake gasket for it just want to find out if thats really it. the intake box has been cut open on top. o also it runs like crap when its cold. so can someone help me out here. maybe a sensor or somthing im missing? thanks alot.

mike

[1990secretgsx]

did you find out where the oil leak was?

[gregc]

Bad MAF sensor? Unplug the MAF and see if it runs any different. Sounds like limp home mode to me.

[Kolat]

if you put a 255 in it your horribly over running the stock fpr and causing it to run pig rich, put in a fpr with a larger orifice to bypass fuel and I bet most of your problems will go away.

T

[talntid]

Also, what plugs are you running? NGK BPR6ES are your friends. Have you boost leak checked it? Also check what Greg suggested.

[idahos_dirty_D]

no i havnt foud out where that oil leak is comin from. shits leakin in like 3 places. the thing is before i i put the fuel pump in it killed gas to. so ill check the maf and i want to do a tune up on it soon so ill look into those plugs and run a boost leak check. thanks guys.

[talntid]

does it obviously burn black? does it have stock injectors for sure? does it get any o2 readings?

[idahos_dirty_D]

it doesnt burn black. stock injectors and i dont know if its gettin a o2 reading. it hasnt thrown a check engine light. i plan on ordering a wideband next week. i have a safc for it so ill data log and tune it shorty. i unpluged the maf and it just raised the idle still idling like junk.