I need help getting tuned

[rssshen vette]

Ok here's what's going on.... I've done everything needed to build my 383. A few months ago I got a mail order tune from Fast Chips after changing my intake from TPI runners setup to a Mini Ram. The fast chip tune has my car running a little better than the old tune. It pulls hard when I stomp on the accelerator, but it has a slight low tone popping sound only when at steady cruising speed, and every so often it has a slight stumble when taking off (700r4) from a stop. I'm sure it's an air/fuel mixure issuse. The idle is between 7-800rpm. My spark plugs, wires, and distributor components are all good. My fuel pressure is 42psi. I know the 85 ECU is a dinosaur. As much as I want to.... right now I'm not in a position to buy a after market stand alone ECU. A mail order tune is too much hit and miss. Can anybody link me to a shop or forum member that can do a dyno tune or street tune? I'm willing to take a 2-3 hour trip. I'm willing to do an 86 - 91 165 ecu swap if there's someone who can help me out with the process. I have tried to data log the engine info on my laptop using WIN ALDL, but the info won't save on my computer. So this is my last go round trying to get a good tune.