Find the exhaust restriction and fix it. Begin by loosening the pipe at the exhaust manifold flange and checking for acceleration- - - -then move back one coupling at a time until it bogs down again. The engine is constipated- - - - -"Can't pass anything!"
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!