Problem after starting

Hello

I have a 98 GC Sped Edition.

Recently (for about 2 months now), after I start my Jeep up and drive through a parking lot (15 mph and less), my jeep hesitates a little and losses power. To regain it, I have to release the accelerator and step on it again. I took it to the dealer to get it fixed. They said it was my sparkplugs, so they replaced all of them and even the distributer cap, and also re-newed my sensor chip.

Well, all was fine for about a day, then the problem started again. I moved 2 days after I took it in to the shop, so no luck going 1000 miles to fix it again.

I'm open to any suggestions.

I was going to take it in again but it's Sat, and the shops are closed.

Thanks in advance

Well, I took it in to Midas this afternoon, and they ran a diagnositic on it. Found out that the rear O2 sensor was in the OPEN position. The front one was working fine though. They are going to replace the part on Monday.

Does the O2 sensors make the driving better after a start?

Does that sound like it would do the trick?

Thanks in Advance.