Gmc truck ,no power??
 

Im here to see if i can get any help. Im just trying to help out my dad since he nows nothing about computer and internet. its my dads 94 gmc sierra truck v8 . it has no power. it will start ok but when its on drive its really slow . the fastes it goes is 10-15 mph. he already checked distributer cap,rotor, spark plugs, timing(he might not have checked it right).I installed a new catlatic converter. the truck has a flowmaster that was installed about 4 yeasr ago. the injectors seem to be spraying ok. my dad and i are ok when it comes to mechanic but this is way beyond our minds. HELP PLEASE!! could it possibly be the sensor from the tranny?

RE: Gmc truck ,no power??
 

How dose it act when in park or neutral like when you rev it is there a check engine light? Is just not shifting into any gear but 1st? Have you tried to shift it manually?

RE: Gmc truck ,no power??
 

when its in park it sounds good, no check light. it get all the gears but it feels as if im hauling a trailer.

RE: Gmc truck ,no power??
 

Try to PM Argon youll see his name in the box on the right. He might know