Hello, I have a 87 Comanche 2.5l base... I have been having trouble with the throttle. I start out and it's fine if I keep my foot on the gas (especially with some load) once I let off the gas a little it acts like it's starving for fuel or atleast dying.. I have to push the throttle down all the way and then it kicks back up and runs fine.. interstate driving is fine but in the city with all the stopping and speed limits, I'm not able to keep the throttle down, so it acts up. Please help! I have rebuilt the carb, replaced the throttle position sensor and the fuel filter...