Nissan stalling help!!!

[troublesomenissan]

I have a 1988 Nissan Pulsar. The car sat for 3 years, and to save on gas I decided to buy a new engine for it. I put it in and it ran super for about 50 miles and then it started surging and stalling. It will get up to about 65 miles and hour and then after 2-3 miles of normal terrain or 1 mile of hills it starts to act like it's starving for gas. I had the local shop run a diagnostic test on it for about a month and they didnt' find anything out. I have replaced the distributor, ecu, distributor cap, spark plugs, spark plug wires, coil, injector, cleaned out the injection system,fuel filter,fuel pump and had a fuel pressure test that showed plenty of pressure. They car "bunnyhops"and will sometimes die on the road. If I stop and turn the car off and the start it back up it will take back off for about a mile.Please help me!!!

[lafreedom]

try disconnecting the lines to the charcoal canister and then drive it around. if no change, then hook all the lines back up and replace your fuel cap...the cap not venting may be the problem

[jamesgeorge]

i have a 1987 nissan pulsar that seems to be not getting the gas to the engine what can be the problem?