I took it to a recommended local garage near the hobby store where I work.
It turned out to be a coil pack on the #4 cylinder that had gone bad.
Cost: Parts:62.52, Labor 98.00, Tax 13.84 TOTAL: 174.36
It also turned out that the rumble I have been hearing was a bad front wheel bearing.
Replace both front wheel bearings:
Parts: 490.00, Labor: 295.00, Tax 67.71 TOTAL: 852.71
GRAND TOTAL: $1027.07
*sigh* This will take some time to pay off.