ok first I did the this:

With the ignition off, unplug the MAF and apply power to ALDL terminal
"G". Check the red wire on the MAF connector for power. If no power,
verify 12v on relay connector orange and white/tan wires. Verify the
connector black/white wire is grounded. Verify black wire from MAF
connector terminal B to ECM connector A11 with an ohm meter. Verify
red wire from relay connector to MAF connector with an ohm meter.
If all is good replace MAF power relay.

Turn ignition on, Check MAF connector dark blue wire for 12v, if so,
unplug MAF burn off relay and check again. If so, check relay
connector black wire for ground. If so, the black wire is shorted to
ground or the ECM is bad. If not, replace MAF burn off relay.

If the dark blue wire at the start of the above test had no voltage,
check the MAF connector dark green wire with ignition on for a 5v
reference signal. If so, and all connectors are good, replace MAF.
If no 5v reference on dark green wire, verify it from the MAF connector
to ECM connector B12 with an ohm meter. If the wire is good replace the
ECM. If the dark green wire has 12v on it, turn ignition off and unplug
the ECM connectors. Turn ignition back on and check again, if so,
it is shorted to power somewhere. If not, and all connectors and
grounds are good replace ECM.

everything checks out except this part.
G". Check the red wire on the MAF connector for power. If no power,
verify 12v on relay connector orange and white/tan wires. I have no power at the white/tan wire. What does this go to and how do I get power to it. Thanks in advance. Also car is a 87 Iroc z-28

 

The white/tan wire is the fuel pump feed. It comes from the fuel
pump relay and energizes the MAF power relay and sends a signal
to the ECM that the pump is running and powers the fuel pump.
It will only be hot when the ECM is running the pump or the ALDL
terminal "G" is jumpered to power. If it has no power during these
two conditions you have a break in the wire somewhere.

The wire comes from the fuel pump relay terminal A and goes to a
junction which splits to the ECM terminal B2, the fuel pump, the
oil pressure switch just above the oil filter and to the MAF power
relay terminal "D" which energizes the relay.

Check continuity between all of these terminals and you will be
able to determine where the break is.

 

OLD POST Revived

This probobly has alot (maybe everything) to do with my "emergeny" post also active on thi sboard, BUT, I have my Oil Pressure Switch un plugged (no room for that and the other sending unit with LT1intake, and havent relocated to ther port yet)

But I am throwing a code 33, MAF is fine, TPS is new, could the disconnected Oil Pressure Switch be throwing my code 33?

...and maybe making it so it intermittently doesnt start when Its hot?

Please be this easy!

 

No, the oil pressure switch/fuel cut off is a redundant circuit which is not needed. I have come to the conclusion that it is probably an orphan circuit left over from the design stage that was never deleted from the schematics.

If you study the circuit in a diagram you will see that it is not needed. There is no reason for it to be there.