Almost stalling at idle

[crsgmc]

1996 K1500 5.7

I have rebuilt most of the truck. Most parts are new. I got a code for EGR a while ago and took it out and cleaned it. A few months later the code was back. I replaced the EGR with AC Delco. When doing that I sprayed some throttle body cleaner it the port for the EGR. The EGR code did not come back on, but it ran very rough. It stays on high idle when coming to a stop. It does drop down 10 seconds after you have stopped. When sitting at idle it is running a little high at 900. It always idled at 700 before. After idling for a few minutes it will drop to about 300 to 400 and almost die. It will then recover only to do it again in a few minutes. Is it possible that the cleaner gunked up something. I think I am smelling fuel out of the exhaust. Thanks for any help you can provide.

New EGR, IAC, Throttle position sensor, Engine: new GM crate with 17,000 miles