Idle is only sligtly rough, but Engine surges when throttle is opened
slightly. This happens when driving slow and steady with engine warm. I
can duplicate with air cleaner off and hand open throttle. Spray from
both injectors is even fan and can be seen to increase and decrease. No
Tach is present to log RPM. I have change throttle position sensor
trying to solve this. Also Cap/Rotor, wires and plugs as part of
regular maintenance. All Looked OK but changed any way. There is no
fuel pressure gauge or place to install one that I can see to determine
fuel problem. Disconnecting and pligging the EGR vacuum line solves
problem, but may not be the cure.