I recently bought a 97 Tacoma that had a 2nd gen SC ( black) and the urd 7th injector, not sure if they also installed a better fuel pump, but the pressure is at 48 psi,

The truck starts up and runs great, but when in higher gears it leans out.

Is there a way to check if the urd system is working properly, or how I could trouble shoot this problem.

Thanks in advance, also not sure if I posted in the right place.