Hello! I change my dpfi for mpfi and i have the same problem all ready i change distributor cap rotor wires spark plugs and still doing the same. idle good but when get hot and high rpm start doing the same sh::::: computer give me code 20. The first problem i fund was the coil give me spark sometimes and other time nothing change mudular and the same stuff, well i cahnge all the distributor and now start and idle good. I thinking put the water running throw the trottle body. I check the alternator and he give me only 13.45 with nothing on, when i turn everithing on go down to 12.45 that mean not charge???? bad alternator?? I don't i tired of think. Any Help THX