i have an 88' firebird 2.8L MPFI v6

I usually start the car and it runs fine, drive it for a bit (fine) then after awhile and sometimes i start the car i get a check engine light, which reads Code 34 only, i check the MAF wiring with ignition on got 5v on signal wire, checked the power little above 12 volts, started the car hit the MAF and wiggled the wiring and connector and it did not stumble, i checked the MAF fuse it's fine and i changed it anyway. I also checked the connector to the relay and it seems to be good volts wise doubt its the relay since its an on/off situation unless im wrong? and the also cleaned the ground wire next to the fuse, then i checked for leaks in the intake system (none) and figured it could be a vacuum leak which i doubt i checked most the lines with water/eye inspection changed the ones i suspected and i have good vacuum, im not really sure on any other options, i doubt its the MAF Sensor itself because its not on from begining to end all the time it usually triggers as i drive every so and so times plus the MAF is pretty clean and has the screen on it as we'll, but it'll stay on till i shut the car off, and sometimes i start it and it turns off or on. depends how long it sits but once it triggers the idle stumbles at stop signs, lights, etc and feels like it's going to cut out.

i changed the TPS i have a voltage of .54-.58

changed air filter, pcv valve, and the essentials, also cleaned plantium, and torque to specs.

i also have a broken cooling fan overdrive switch i believe? left rear on cylinder head one wire switch but i doubt that effects the MAF, going to replace it friday.

and i want to adjust the idle since the rubber boot is missing (previous owner) but the in car tachometer is deffinity unreliable and i have ZERO clue how to hook my two wire hand held tachometer to the engine. I believe it should go on the ignition coil but i have no clue where...four wires + distrubutor coil wire.

PLEASE HELP ME !!!
and if anyone knows how to hook a hand held tech to this beast let me know thank you

-Chris.

 

anyone?

 

You mention a rubber boot that's missing, what boot is it actually?

 

the boot that's on the throttle body for the minium adjustment screw, which means someone tampered with the idle at somepoint.

here's my updates, the code 33 & 34 come on at intermittents.

i put a new TPS on adjusted to .54, adjusted Idle, new air cleaner, made sure theres no pin holes in intake flow tubes sealed them with JB plastic weld just in case, new IAC Valve, and changed both ECM & MAF fuses by passenger fender, switched the MAF Relay by radiator support with the one on firewire exactly same Model #'s too see if i get a different code for a bad relay spotting, checked the MAF wiring 5v on signal wire, grounds ok, and 12v on power wire.

so far no codes, but its intermittents so it could pop on at anytime it usually spring forward when i drive.

any clues fellas?

also does anyone know which way the air box faces? the flow in big black box, previous owner had it facing toward the front of the car..