Hello, I got a motor from some dude, put it into my truck, sorry it is a 95 sierra Z71, 350 V8 TBi. Same motor that I pulled out.
I have it running, and when you rev it in park it sounds great, however if I put it in drive and push the gas it runs rough. it seems like it gets to much gas. I can drive in first and barely press the gas to get going. If I push the pedal down it seems to bog out and may lightly backfire. when I get going the engine revs up high fairly fast and it shifts to 2nd, then revs high fast again and goes into third. Remeber I cannot push the pedal down to far.
WHen it is in third, if I do push down on the gas the engine goes and will end up hitting 4000 or so RPM's but the truck will ge no faster than about 85K/h.
it drinks gas ofcourse because it is running in such high revs. there seems to be a lack of power to the tranny? not sure.
Timing is dead on and there are no air leaks.
Could it be that the other guy put the distributor on backwards? OR any suggestions on what to check?
The engine I pulled out had great power and did not give this problem, the reason I pulled it is because of the amount of oil it went through. in 200km it would burn 5 litres of oil.

Please help, I am out of a vehicle, and I know you guys/gals are great at troubleshooting.

Thanks

 

i was doing a timing chain on my truck one time and accidentaly put the distributor in backwards...it was horrible i started it up and it was backfiring out of the intake and the exhaust! it backfired so bad it completely stopped the motor in a split second.. but had that fixed in a couple hours so if it was 180 out because theres only two ways the distributor goes in at 0 degrees and 180 out, it probably wouldnt be going down the road.

 

HHmmmmm, ok.
I am at a total loss then
I have good spark, lots o fuel, no air leak.
But no power, dies if I hold the gas to try and get going, at any speed

 

How about a crossed plug wire?

 

I second checking the plug wires as I have personally done that and if you get them in the wrong place just right on a V8 it idles real smooth but zip for power under load...

 

I have similar problems, but im pretty sure its my intake, it has a small leak after then sensor in the connections.