do you have a scanner to read codes. the light may be off but you could have a pending code. you may want to check your mass air flow meter could be dirty,plugs,wires, coil pack. also check your water pump to see if it's leaking you will see a pinkish/red crusty junk if it is. if water pump is leaking it can interfer with the crank sensor. timing belt could have jumped a tooth.
i dont think its the timming belt i just had it done this summer. i think the mass air flow could just be dirty
