hey guys, i just rebuilt my 91 yota p/u and after getting it running (not after having starting probs and egr issues not to mention fuel injector leaks) I went to have the valves rechecked because it had started making a loud tapping sound unusually louder then normal anyways, The people I took it too said they where real loose and after they adjusted the valves it sounded fine for awhile but after a week of driving and on the freeway i notice some power loss and the tapping came back but louder, i have since parked the truck but need to get it back on the road, any suggestions on what to look for first?

 

have an aftermarket cam?

 

No its the stock cam, so after I posted this I looked under the hood and noticed the TPS adjustment screw was all the way out, i started the truck and adjusted it tilll it was idling correctly, then I disconnected the egr vacuum hose and capped it and guess what the tapping is gone..... can someone explain this to me?