2001 Dodge Dakota

Stopped at store then would not start, I thought maybe timing belt slipped towed home next day started just like allways, 2 weeks later stopped just before turning ingnition off started running rough, turned it off when tried starting it again will run very rought pressing gas pedel no effect, was only running 4 to 500 rpm, then died, will restart but same effect, haven tried but think it will start and run after sitting and getting cold, thought fuel filter but auto parts store shows no filters to replace, so what do you think