my 1988 gta runs like crap!! HELP!!

[hot88gta]

Hi my 88 trans am with a 350 TPI is running like crap!! I checked the fuel pressure it reads 42 psi with ignition on and i watched it for a while the pressure drops
to 30 psi within 5 minutes is this normal? I checked for codes i see a code 33,34 and 36 i did run the car with the maf disconnected to see if that would do anything
one of those codes may be due to that. When i touch terminal A to b to read codes most of the time the service engine light does not flash i need to play around with it to
make it flash and hear the fan come on what could this be? Other things i have done are cleaned the iac valve cleaned the throttle body i also cleaned the mass air flow sensor with sensor cleaner can you please guide me to what could be wrong? Any help would be greatly appreciated!!!

Thanks in advance!!

 

[GatorIsaac]

I only learned this from posts here a few days ago but what the heck.

Check the resistance of your injectors. Heresay says they should measure 11.8 ohms or above cold and hot. I have 3 running low cold and 6 running low hot. Pretty much explains why it always runs rough and gets horrible when hot. Won't even start hot.