Ok so I have a 85 pick up with a 22re the truck turns over fine and will rev up nicely. But as soon as I put it in drive (automatic) and get to about 10mph it almost seems hungry for fuel. But when I try to give it more gas I can hear the mass air flow flap slamming. I think my tps is off and not adjusted right? But I also talked to some one and they said maybe it could be the timing chain to?? But I checked my guides and the tension on my chain and everything looked alright and didn't see anything out of the ordinary. Any idea would it could be? Anything helps. Thanks

 

You could try the fuel filter.

 

Freshly replaced and fuel pump is good

 

What do the codes say? If its your tps it should trip a code.