1990 G-20 Van computer

[kahunaz]

Hi everyone,

I have a problem with a 1990 G20 Chev van.. Well....it Freaks out....When it does...it won't idle (or surges and dies)...runs like Ka-ka...uses LOTS of gas. It's a 350 and itn't great on gas to begin with, but when it's having it's heart attack its real bad.....Well back to the problems...also it chugs and runs GOD AWFUL.....also...whats weird the gauges do weird stuff to.....go up and down...and the SES light comes on.......and goes off.....but when checked will bot come up with a specific code....

Just to be on the safe side I replace the O2 sensor.....

and ...where is the ECM located...(under the dash)...where specifically..??...I had a heater core leak....and a windshild leak too....wonder if it did something to the computer???....

Then sometimes it runs GREAT..????

Thanks folks!!!