Hi, I'm working on my daughters 86 Iroc again and it has a problem where it doesn't want to start. I noticed that it will start though when I hold the pedal about half open. It also runs really poorly and powerless when I drive it. I have replaced the fuel pump, pressure regulator, TPS, IAC, plugs,wires,fuel filter, air filters. I moved the intake air temp sensor to the air intake duct, that is the only mod that I have done.
Any help would be great.
Thanks

 

unplug the maf, see how it runs, if better replace the relays.

 

When I unplug the MAF it dies. I just pulled all these codes too:14,23,25,33,34,42,43,44

 

unplug it first, then start the car
codes>>>
14 coolant temp sensor
23 intake air temp lo
25 intake air temp hi
33 maf hi
34 maf lo
42 est bypass
43 knock sensor or esc circuit
44 o2 sensor lean
some of these may be old codes
i think they are stored for 50 or 100 starts or something like that,
disconnect the battery to clear the codes
and see if any come back

 

I did disconnect the battery to clear the codes. the only one that came back right away was the code 43. Now I cant even to get it to run. In order to get it to start I have to pump the pedal repeatedly. I have to continue doing that to keep it running. As soon as I stop the car dies. I havn't been able to take a fuel pressure reading yet because my gauge is leaking for some reason.
All of the previously mentioned codes are fairly new because she has only been driving the car for 2 weeks.