it's old its an 1986 trooper, what engine, is it the diesel or gas.? the gas is 2.0L or 2.3L do you have one of those? and they ran carbs up to 94 they held the record in USA for that. is car in USA> , must we guess? you never once stated what engine is in the trooper.Did you park it the back 40 , for 10 years.+then try to run it>? ever get a tuneup this decade? no? why? if no. our 86' the choke died and cant buy parts for it so switch to manual choke, like my first car we did it, in a 1959. the 4zd1 carb engine (wild guess on engine)is below. 1: so ever get a tuneup this decade. filters, all, spark parts, cap./rotor, wires and plugs? be like NOWS that time. no?the engine has cam belt that must be changed, did you. if it slips engine lacks power or BUCKS.or going for the 100,000 mile world record? on said belt.......???the 2.0 is chain drive cam, so now's that time to fess up and tell us what engine is there. (about 9 engines world wide, ouch) really.or post your country and your VIN? 2: then if sparks are ok, then its fueling.issues. and the below. clean the carb? (takes me a full day to do that)hard work. carbs are all about that , work.jets, nozzles, emulsion tubes. , jets fell out?is choke stuck on> hot? (like at 86s do)power valve inside (h3ll) fails and leaks.float level wrong, or stuck? or set wrong,3: or distributor timing messed with and is now wrong?4: and over 50 more reasons for misfire.misfire is violent (heard, felt and lower power)bogging is fuel starvation feels like dragging a dead 5,000 lb weight.bucking most times is bad spark, (with exceptions)_