The engine misses and chugs when you first start the car.

What is your question?

The problem starts when you go out on the road and accelerate. Only for about a half mile. If the Jeep sets for a couple hours the problem happens again. I had the fuel pressure checked But pressure holds ok. I don’t think it’s ignition because it doesn’t backfire just act like it’s going To rn our of gas.

What makes this problem better or worse?

Nothing

How long has your 1998 Jeep Wrangler had this problem?

Several years