help asap sr in limp mode

[battle D]

ok guys i seareched for a while and didnt seee anythign on this i need help asap i jus finished putting a red top s13 in my 1990 fastback and everythign was fin it cranked right up and i got my tach working and all but it hits the fuel cut at 2400-2500 rpm in every gear and also when im drivign if i jus put it in nuetral it shuts off, and sometimes it idles ok and sometimes it idles a lil odd and almost shuts off?? any help would be apreciated this is my daily driver i need some info if anybody knows whats wrong thanks

oh yeah and i already switched the mafs and the fuel pump, and checked for any vacum leaks

[yellow_jacket]

If you are running pretty decent, but hitting the fuel cut at about 2,500rpm that is a sign that the ecu doesn't see the maf. Check for power at the maf and check it's output. The check for continuity between the maf and the ecu. While you are at it, pull the codes from the ecu.

[battle D]

thanks ill get onto that tonight also i think its runnign rich as crap cause its burning gas really fast

[battle D]

I dont think that it is the mafs but ill keep checking what I know any other ideas :help hehe i need to get her running normal thanks.

[battle D]

any more ideas anybody i cant stand driving and shiftign at 2400rpm:(

[battle D]

ahhhh im running out of ideas could a bad cam angle sensor have anythign to do with it?????

[battle D]

bump

[yellow_jacket]

if the cas is bad the car won't start. Pretty much the only reason the car will run great but not rev over 2500rpms is if the ecu thinks the maf is bad. Did you ever pull the codes? Did you check for continuity in the maf wiring? Did you check the output voltage of the maf? If you want more help you are going to have to pull the codes and give us some more information.

[yellow_jacket]

btw, if the maf is bad you will get bad fuel economy and usually run pretty rich.

[battle D]

thanks for the help, the mas is good and were checking to see if the mas is getting power at teh ecu maybe its d/c some where in between not sure but the mas is a good one