my jeep has an assortment of problems, but when everything is just right it works great. it is a 88 4.0 with 370k. it stopped working after i pulled and fixed a leak in the radiator. when you turn the motor over i get no fire. i have checked the fuel pressure and i have voltage to the ignition coil. i replaced the coil and the base so far as well as the rotor and cap all to no sucess. i have read that the cps might be the problem. how do you go about checking it since it is fairly hard to replace? any other ideas to get it to start?