Had my indy scan for codes. Stated that there were some stored mis-fire codes in the ECM. They stated that they tested the plugs and wires, which are virtually new and they are operating fine. When I was at the indy and test drove it, it was much better, but still a slight hesitation at low RPM. Later on that night I drove it again and it has gone back to the hesitation at lower RPM.

With the vehicle in park, I connected a voltmeter to the cigarette lighter plug to measure the voltage from the car and revved the engine to about 2,500-3,000rpm holding it steady. The voltage held steady at 14.2 volts. At 2,500rpm you can feel a consistent "mis-fire" if you will, the rpm's fluctuate a little and you can feel the hesitation when the rpm fluctuates. I listened to the exhaust as best as I could also and could hear it miss when the rpm's fluctuated...

The plugs and wires appear to be fine, any possibility that it could be one of the coil packs going bad? I don't know what else it could be. Still no CEL's and no problem starting

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'97 E300
'99 E300