buddy has a 97 3.8.says it started to lose power here and there then gradually lost all power and died.says it started fine,but had no power at all,now wont even start.they changed air filter,fuel filter,plugs,wires,had coil packs checked and are good.no check engine light.
now,my first thought would be a fuel or air issue.closer to fuel pump not putting out enough pressure or TPS going bad(wouldnt this throw a code?)
any help would be greatly appreciated.
Jeff

 

Having not always been right, we learn not to shoot from the hip.
Sooooo, if you can swing it , invest in a fuel pressure gauge and at least see where you are going. Once you know if you have the correct fuel pressure you can go from there.
Until you do that , it's a crapshoot .
You could always replace the fuel pump which can be a pain to do, hoping that was the problem. But,, if it wasn't the only consolation you have is you know the pump is new and,,,,,,,,,,, there are no guarantees that the new one isn't defective. It is becoming a common problem these days with some aftermarket pumps. If and when possible we try to stay with OEM pumps.
It isn't impossibile for the TPS to be defective and cause a "no start", but not very common.
Maybe someone else can shed more light on the problem and answer your questions better.