Spiking tach followed by actual misses

[vex]

Originally Posted by DriftingFC

Last nite, AFTER I installed a racing beat FCD went for a ride. put about 30ish miles on the car, and on the way home, the tach started to jump from about 2.2kish RPMS down to about 1.5K. I was in 3rd about 30ish MPH, and then she felt like a miss was happening.

Sound like a coil pack going out? I have not looked at her yet, Will do that later.

When and where was the last time you filled up? Any other symptoms? Any other reason to believe your coil pack is going out?