Someone game me a 1992 ranger because they were told it had burnt valves. It is only firing on the exhaust side (2.3L). The truck will only idle, but very rough. Timing seems to be way off. I replaced the DIS module. Could my crank sensor be bad, will the truck run at all if the crank sensor is bad? I read online that it could run fine on just the exhaust side plugs firing. SORRY for the babbling...... thanks for any and all help in advance.