1991 Chevy Camaro idles rough won't hardly run

Changed map, o2, and throttle position sensors. Fuel pressure at the shrader valve is 40 psi at idle, when engines stumbles it bounces between 40 and 50 psi. Cleaned egr. I put fuel stablizer in last fall before it was put away, added 5 to 6 gallons of new fuel this year. That didn't help.

Is the mil on and what are the codes its throghing

The mil comes on for a second then goes off, never stays on. My scanner doesn't work with obd1

If it inly comes on for a sec and then goes out the it probly doesnt hve codes listed but if you jummper terminals A and B the two upper rith most pins it will set the car into diag mode and flash the mil light if there is a code the it will show the first will be code 12 thats one flash, pause then two flashes, this will repeat three times the if there is a code set it will flash three times and so on for every code there after for example 5 flashes pause and then threee flashes is code 53. After you do this you can come back here and look up the codes it gives you in the code definations section.

It sounds like you might have a bad controle mod or pickup coil you can test these.