beyond my knowledge....

ok, heres the problem. i drive a 91 si. and its got a bit of a problem. below 3000 rpm it just doesnt want to go, like its firing on two cylinders almost, then around 3000 rpm, its like hitting the nitrous button or something, and im in full power.

it feels almost like the fuel injectors are half open till 3000 and then bam, wide open.

ive got an intake, headers, empty cat (no inspections means no cat, go arkansas) a flowmaster and a custom grounding kit, im also running an amp and sub, but nothing extreme at all.

ive got several theories, but i thought i would run it by you guys as well.

first, im thinking perhaps the alternator just isnt creating enough electricity below 3000 to provide ample spark.

second, could my ECU need to be reset? (havent ever done it)

third, timing belt?

fourth, bad gas?

anyways, any of you guys know whats going on?

i had a similar problem, not quite the same i just cahnged out the ignition wires and it was fixed. you would be surpised how important they are. it sounds like its just misfiring.

thing is, i replaced the spark plug wires and the wire that runs from the coil (?) to the distibutor, and it still does it. am i missing some other wires?

oh, i should mention, its only every now and then, usually when pedal is pushed down quickly. (ie, i can gradually push the pedal down and it wont happen, but if i slam it down, it happens)

Did you change your plugs as well?

hmm, plugs are pretty much new, less than half a year

now that you mention that....sounds like a fuel system problem...

ive been thinking dirty fuel filter too....how often are you supposed to change those?

lets hear it for fuel system cleaner!