I been working on a 87 k5 blazer.5.7 l,700th tranny..I have no catalytic coverter in the truck,it was bought that way..Is there any tips anyone out there can give me to make the truck run better? I recently changed out the fuel pump and the radiator cooling temp sensor which made a big dfference in cold starts..But when the engines cold it seems kinda shakey till the thermostat kicks in then it settles down..Is this normal?Any help will be greatly appreciated!!

 

*Moving to Fullsize Tech*

I'm betting that it doesn't have the heat riser in the passenger side exhaust tube. The heat riser was a thermo-spring controlled restrictor valve that accellerated the warmup of the engine by restricting the exhaust flow.