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Could be that the catalytic converter is stopped up or the timing belt or chain needs to be replaced. When is the last time it was tuned up? May need plugs wire etc. Fuel pump may also be going out get a pressure gauge or have it checked for fuel pressure
I would start with getting the right firing order you can look up the spec online at autzone on there site they always have diagrams than start by checking and making sure that your getting fuel either a clogged fuel filter or a bad fuel pump that is starting to go bad. Make sure you only have 1 fuel pump some cars have 2 if you have to chances are the one inside the gas tank is the one that 99% of time goes bad but check both for fuel coming out of them to be sure. To me it sounds like your ignition componenets need to be checked and make sure your confident on your firing order than start diagnosing .
If you have the 91 3.1 V6 Rodeo you can't adjust the fuel pump or fuel pressure. The only thing you can really do is to get a throttle body rebuild kit that will have a new diaphragm for the fuel pressure regulator. If you want to adjust it, you'll have to get an aftermarket regulator and install on the return line (the smaller line) and remove the spring out of the regulator on the throttle body. If you feel the fuel pressure is too low, then you might need to change the pump. Its located in the fuel tank, only takes 1 or 2 hours to do.
I had the same problem and read on several foruns that the FUEL PUMP is behind the rear passenger side tire, Usually its the wiring not the pump, and in my situation it was the MAP sensor.
Acted like it was not getting gas but was, changed the sensor and it was running again.