I have a toyota 6fgu18 that I been working on. It's LP with impco regulator model J. I already check the regulator and lock off and re kit the carb. I check the distributor, replace the coil and swap the module with another. The truck runs fine when it's cold but shuts off after a few minutes of running and will not start again till the next day. I tried using starter fluid even that it's hard starting. I'm getting spark and fuel, have a compression of 125 all across. I also check the manifold when I remove the carb it looks clean no gunk. The regulator was rebuilt by the customer and the only problem with it is one of the diaphragm was put on wrong and I corrected that already.