Hello everyone. I'm glad to finally be a full member on this board. I just recently bought a 1984 K5 Blazer from a guy who performed a carb to TPI swap. The engine is a rebuilt 350 from an ’89 Blazer and he used the complete TPI system and computer from an ’85 IROC. The truck starts perfectly each time it’s cranked. It idles nicely and for the most part it drives well. The only problem is at low RPMs in the range of 1mph to around 15mph. The engine seems to ‘bog-down’ in this range and it is only corrected if I give it a fair amount of gas. If I lightly feather the gas pedal then it surges and hesitates. Once I get above 15-20 mph it’s smooth sailing. It does this each and every time that I get back into this range. If I stomp on it from the start then it speeds up well with no hesitation. I CAN drive it around but I prefer not to until this gets fixed. Also, the fuel pump runs constantly when I turn the key to the accessory ON position (but before I actually crank the engine). In my other car (a ’93 Z28) my fuel pump will pressurize and then stop, but this isn’t the case with the Blazer. I’m not sure if this is the root of my low RPM stumble or not but I thought it was worth mentioning. All the fuel accessories are aftermarket. He was using an inline fuel pump that is located in the engine bay. One extra item to note is that all emissions have been removed from this motor. Most things I’ve read on this type of problem seem to be solved with an EGR fix, but that won’t work in my case. I’ve cleaned my IAC and I replaced my TPS. I set the TPS at 0.54V. The problem is still there though. I've spent almost one full month searching for answers to this over on thirdgen.org but I've never found anything that helped. Therefore I decided that it was time to pony-up and become a paying member on this board. Any info is greatly appreciated. Thanks!