i have a 94 s10 blazer 4.3 vortec. when i first start the truck it will shift into gears and move normal. But after driving about 5 mins it will loose all acceleration. I can put it into drive amd give it gas and it won’t move. if i **** the truck off. wait a couple mins and restart it will shift fine again but 5 mins will do the same thing. Trany shift selinoids were replaced last month. and had been driving great. this has me pulling my hair out trying to figure it out. took all sensors off and made sure it hey were cleaned up. and connectors ok. if someone can point me in the right direction or be amazing. i have read and read on the boards and found similar issues but no remedies.

 

Do you have an ODBI code reader that works on your truck? Do you have any codes? Can it look at sensor values?

If not, do you have any codes with the paperclip method?

Have you performed the fuel pressure test in the sticky?

Could your injector be loose again? How long did it run better after you reseated it?

Look at spark at one of the plugs while the problem is happening if it occurs in park when warm.

Do you have the "W" or "Z" VIN engine code (8th position I believe)?


George