Hi guys,

I have a 93 5.7 tbi in my truck and it runs alright but if you hold it at a high rpm, like 4000, for about 30 seconds it seems to clean out. It quiets down, doesn't vibrate as much, and gets really responsive. After about a minute of running at low rpms it goes back to running just ok. It's had this issue for as long as I can remember. I would love to finally figure how I can get it to run beautifully all the time instead of after i've held it at high rpms.

Any ideas would be greatly appreciated.

 

how is the timing on it?

 

I'm not sure, i'll check it out.

 

I'd do a tune up such as new plugs, wires, rotor button, dizzy cap, fuel filter, etc.