dude you should be gettin a code. i have a 97 2wd and it was doin the same thing. i personally have a code reader and checked it myself. engine misfire on number 2 cylinder. i changed all plugs and wires and also changed the coil packs, since they have never been changed. runs like top. not sayin that is what is wrong with yours. the check eng. light should be on though.

__________________
4rd4life

1997 Ranger 2wd xlt / 2.3 /K&N Cold Air Intake / Manual Transmission / 16" Ultra Maverck Wheels/ 245 50 ZR16 Michelin all weather tires