my 02 3.0 does the same thing, not all the time but on occasions. started three years ago, and got bad three summers ago. only thing ive done that fixed it for a while was getting stuck in a mud hole, even then the problem came back after a year

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2002 Ranger Edge 2wd | 3.0 v6 auto 8.8 4.10 L/S | 32x11.50 Mud Kings | 28% tint | Chevy Shackles | Cranked B T-bars | Westin Bull bar w/ KC longrange| Three-tone airhorns | air box mod | k&n drop-in | foglamp mod | explorer ohc | alpine headunit | 10" mtx thunder 4500/custom box | kenwood amp| 4 wheel disk brakes | line of fire