Why is my car jerking violently in 4th and 5th gear

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I have a 92 colt, car says Mitsubishi title says Dodge so I don't know what it is. It's a 5 speed manual transmission. It started jerking violently when in high 4th gear and 5th gear. I changed the plugs and wires and oil and oil filter are new. I still have the same issue. I have to pull over and shut off the motor for a couple minutes then start it back up. But as soon as I pass 50 or so MPH it starts up again. It's a 4 cylinder and I also put in some fuel cleaner stuff to no avail. I ordered a new fuel pump and fuel filter for it but it cost me more money than I can really afford and am just looking 4 an answer to what else it might be please help me I have to work in the morning