94 chev van, no power, lousy gas milage

I am still inclined to think the spark ping on hills is a clue, mostly because the other tbi truck does not ping

Any way to check the Timing out of sync theory without dismantelling the engine

Took this thing out yesterday with an old auto xray scanner hooked up to moniter as I drove. Went about 8 miles to warm it up to a long hill that the vehicle does not like to climb. As usual it pinged loudly as soon as the hill slowed it down. What I found interesting is that the knock sensor showed 0 response and the knock retard showed 0 degrees. Other readings were coolant temp 194.9, engine run time 1800 secs, egr cycle0%, ccp duty cycle 0%, ccp purge off, idle kicker 0

the retard and egr do not appear as they should. Does this information shed any light on the problem

Ok, probably take couple of days to get one with the same number.

Any trick to replacing it, do I just unplug the old one and plug in a new one. Do I have to take the battery cable off or anything else .

Ok, I have a used computer complete , correct number, from a 94 s10. Do I have to change the prom anything else before I install it. This is a conversion van with the computer located behind the b pillar

Wow, you guys are fast. Will do tomarrow and let you know what happens

Installed replacement pcm. Ran about 20 miles, non highway, about 45 mph. Did notice difference. Spark retard showed up to 5 degrees retard and showing activity on knock sensor. Feels smoother. But the service engine light is on and no codes. Should I install original prom .

Do you mean the original prom?

I TRIED PUTTING THE ORIGINAL PROM IN THE S10 COMPUTER. ALL MY PROBLEMS RETURNED IMMEDIATELY. SOOOOOOOO I PUT THE ORIGINAL COMPUTER BACK IN THE VEHICLE WITH THE S10 PROM INSTALLED. The improvements were immediate. Question is what problems will it cause using a 6 cyllinder 4.3 prom in an 8 cylinder 350 van

It works so much better with the 6 cylinder chip. What possible damage will it do if I run it till I can get the correct prom