1991 Buick Century mileage: 104,000. Problem #1 - About 45 mph when converter clutch (T.C.C.) Comes on, car starts jerking and bucking hard. Acts like bad ignition module under engine load. Ignition module replaced, along with coil packs, spark plugs and wires. No change. Problem #2 - When taking off from a stop or trying to maintain freeway speed, car keeps going slower. More gas given, slower it went. Acted like a carburetor engine with a bad accelerator pump. Then it would suddenly take off. The next time you stopped and/or if you turned the a/c or defrost on, same thing again - only much worse. Replaced throttle position sensor (T.P.S.) Problem #3 - Check engine light - code 44 - lean fuel system or exhaust. Replaced O2 sensor, fuel filter, fuel pump relay and had injector cleaned. Cleared computer code. Problem #4 - The real problem! These are all related to one common reason - these problems only happen when it rains. I have checked all the wiring, can't find and exposed or corroded wires or connections, checked PCM - dry as a bone. After it quits raining and dries up car runs great. HELP!