Nissan misses when warm

pickup
nissan

#1

Have a 1996 Nissan P/U with 250k miles, the engine starts up fine and runs ok till it comes up to operating temperature, then it starts surging/missing and will not go above 3k rpm with or without a load on it. Misses badly when you floor it when it?s warmed up. Does not give any codes and I have replaced the following items with no luck: Cap, Rotor, Coil, ING Module, & Fuel Filter. Plugs are fairly new (less then 6months) along with plug wires, & air filter. Also have cleaned and tested the MAF sensor & it?s connector. Get 1.5 volts at idle and 3 volts around 3k rpm. Any ideas on what I may have missed?



Thanks,



Bill


#2

Check the coolant temp sensor for the computer.

Tester


#3

What is the fuel pressure reading at idle and at 3k rpm? What does the fuel pressure do when you floor it?

Post back when you solve this problem.