[llih]

Thanks for the info.

I have been over and over my engine, so may times, I think I could disassemble the top half in my sleep. The other day I got out the propane torch again to look for vacuum leaks (5th time). I noticed that there was a slight increase in rpms when the propane was applied on the right side close to the IAC. I thought it was either the IAC or perhaps the manifold. I re-torqued all the manifold bolts and removed the IAC . It like yours had a couple of scuff marks. I went to the P&P and found another IAC. It looked perfect. I put it in and started the truck. I thought I had solved the problem. The engine sounded good at fast idle, then as the engine slowed the surge returned. I put the truck in drive and the surge disappeared. I went back over it again with the propane and could find no leaks.

I did catch something that I hadn't seen before. I noticed that the gas as it is sprayed from the injector hits the bottom half of the injector support tower and then drips into the throttle body. Maybe that is what is causing the problem? Anyone know if that is a problem or is it normal?
I don't want to send the injectors out if this is normal.

Thanks Brad