Ok i run my car for 30 minutes or so, then the rpm's start stumbling, and it wont even go faster than 5mph, and i cant gun it cause it wont go no where, and i got a code 44 master relay, so if anybody has been throgh this anything would help:hail:

 

On an '89 IROC (likely a TPI) the "44" is for a lean exhaust. I'd suggest you start by checking fuel pressure.

 

Vader's right... Maybe your fuel filter is badly clogged. Does it stall?

 

Or your fuel pump is taking a dump. It's been known to happen to these cars. But, like the other guys said, check your fuel filter first, it's cheaper.

 

If it's not the filter...sounds like the pump is overheating maybe. Do you run it below 1/4 tank frequently? Is the problem more pronounced with less gas in the tank?

 

Yeah i do run with 1/4 tank at times, well most of the time, but like i changed the fuel filter, and it still did it, i changed the ignition coil, and it still does it, so now i dont know what 2 do.

 

Try running with close to a full tank and see if it does it. If it takes longer to happen, or doesnt happen, then your fuel pump is overheating. That's what it sounds like to me. t's an in-tank pump, so having extra gas in the tank soaks the pump and cools it. Running low on gas lets it heat up too much and burn itself out.

 

are there any high performance parts for this type of problem? and i also get a code 34, and i got a new maf. So what do i do to get rid of that problem?

 

wait i remember being at lil bit less than 3/4 a tank and it still did it, so if its not that what else could it be? my ignition?

 

When it starts doing it...if you can keep it running, check your spark. But it really does sound like a fuel delivery issue to me, unless you're like dumping black fumes out your tailpipes.

 

how about the rotor? or the fuel pressure regulator? u think it may be that? i mean i got a brand new 49,000 mile engine 350 TPI so im pretty much pissed off at my car and at myself for not finding the problem

 

Get that fuel pressure gauge connected yet? I think it might reveal a lot.