6.0 poping/hesitating. What could it be?

Hey guys, Just finished a swap putting a 6.0 in a 92 jeep cherokee. the motor is an '07, has a walbro 255 pump, vette filter, computer and harness by S&P, and ls6 intake with truck injectors/fuel rail. Runs really good...for the most part. The problem is it feels underpowered and will sort of hicup and stumble at WOT. Im wondering mostly if the problem is revolving around the ls6 intake/ truck injector situation or maybe the fact that the computer was programed for the truck intake. any ideas on where to start?

If its only doing it at WOT. Could it be a fueling problem?

I agree maybe has something to do with the injectors.

Start with a fuel pressure gauge. Check the fuel pressure while making a WOT pull. You may not be getting sufficient fuel pressure. You should be around 58-62 PSI at WOT.

Ok, i will report back after i do a fuel pressure check.