Code 45 problem

[wayne2012]

I have took this truck to 2 different shops and still have the same problem(as got worse).

1988 Chevy c1500, 305 TBI. Truck only as 189k miles on it and engine was rebuilt, but not sure when(be for i got it).
Edit: truck is automatic with stock trans(engine is stock as far as i know).

What truck does:
Surges when stopped at red light.
shacks/vibrates at idle.
Idles around 500-600 when in park.
Idles jumps around from 1k down to 500 rpm when stopped and in gear.(not all the time though).
burns lots of fuel.
acts like its bogging down when driving and some times when you floor it it really bogs down(like its flooded type bogging).

Parts replaced/things done:
ERG valve/solenoid
spark plugs/wires, cap/rotor, coil.
Map sensor, coolent temp.
Rebuilt TBI
fuel pump/filter
02 sensor (end of last year though for this part be for problems)

Sprayed carb cleaner around intake/TBI and vac lines, had no change in idle.

Checked timing- timing is correct, but every now and a then jumps light around(think cause of the bad idle).

Injectors spray a coin and doesn't seem to be dripping. Even tried key on engine off to see if they drip.

Fuel pressure was around 13, what last shop said(who knows they didn't fix the truck when it was there... so they might have guess..)

Its a old truck and only a 305.. but it was my first truck and i still love it(even though i have a 07, i drive the 88 quite a bit).

I hope some one can help me out, no one else as(shops).

P.S: truck as no cat converter.