86 4x4 22re struggles to turn over. will not start. new starter new battery. have not done compression test. when all 4 spark plugs are removed turns over like crazy. truck ran rough b4 but never failed or let me down even through extreme conditions/terrain. help! ive tried various things. did valve adjustment about 2 weeks b4 she died. went back to check valve adj. and it was corect both on in. & ex. Maybe timing went bad? not sure but any suggestion will be appreciated.