2001 isuzu rodeo Popping sound underneath -sometimes it sounds like it is in the engine sometimes it sounds like it is underneath or by the wheels front or back. It usually happens during acceleration but does not lose speed. I have heard it a few times even coming to a stop. what in the world could this be?

Need more info. Does it happen only in motion? Does this happen when sitting still and increasing the rpms? Does this happen when turning or going straight or both? Have you checked around your radiator fan to assure nothing is simply touching the fan? What sort of "pop" is it.. can you feel it in the steering wheel? Does it have a metallic sound, a dull sound or maybe even a plastic sound. Popping sounds are hard to diagnose without loads of information on them or even a more generalized area where the sound is coming from. Your description of where is coming from, pretty much said.. all over under the truck