1990 Chevy-305 Surging Engine

[Air Force One]

Chevy-1990/V8/305 engine: When starting you sometimes have to push gas pedal. Once started it idles fast/slow and surges up and down. When at red light you have to keep it in Neutral and give a little gas. Service Engine Soon lite is on. Have not gotten it checked. I did take it to Advance Auto...they told me they cant check that year since they dont have the right scope to do it? When driving it around and you give it gas it surges, then when you let off pedal some it takes off. We have replaced TPS, EGR valve....MAP was replaced but not driven around. do you have to drive with new MAP on to get it into play and running smoother, or is it a instant fix...Any advise experts...thanks. AF1

[Crawdaddy]

Your truck would be OBD-I, which AutoZone's code readers can't read, it's too old. However, you can bust out your handy-dandy paper-clip and I'm sure you can tell yourself what the issue is.

http://www.extreme-check-engine-ligh...%20Decoder.htm