4A-GE MK1 Engine car driving rough/ 20 mph/ backfire noise, help!! [Archive] - Toyota MR2 Message Board

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ok. so I have an 89 auto. Once in a while the acceleration would struggle coming off a complete stop, like it was not getting enough fuel so I changed the fuel filter and took it for a test drive, It feels like it got worse. It had a hard time passing 20 mph and 500 feet to my driveway it barely drove 5 mph ( going uphill ) What could it be? I also smelt a burnt popcorn smell coming from the engine. Also, heard a popping sound like an exhaust backfiring. I did get the a/c changed to r134 last