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Hi I have a 1987 sammy that runs great except it wont do over 55 mph when you come to a hill its like you are pulling a trailor it bogs to the pt of downshifting, I checked commpression, timming even put on a new coil, I replaced the carb with a propane system my original plan) and still the same thing, The exhaust is brand new looking but it was on it when I got it a yr ago, the caddilatic converter doesent seem clogged but I havent broke it loose and checked that I did pull out the o2 sensor and drove it but no diffrence, nothing on the drive train seems to be getting hot, Any clues would be great,