I pump it or dump it.
Think about it, if you limp all your PPs then as soon as you limp, people will know you have a PP. You're supposed to disguise the strength of your hand, not broadcast it.
On some tight tables I will play low PP's from UTG, but I always bring them in with a standard 4xBB raise. It works better on a tight table because it's easier to represent something bigger if you miss the flop.