Rough idle and slower throttle response
1997 SSEi, Just bought car. Started with the basics, changed all filters and fluids. Began performance tuning. Installed Autolite Dual Platnium APP605 @ .055, improvement over stock. Next installed a set of Magnecor 8.5mm wires, again an improvement. Installed an Intense Std PCM and 180 stat, what an improvement. I then installed Gatorback belts on the accessory drive and the */C drive, eliminated slippage. Great so far and I felt this was a good order of progesssion. I then decided to work on the air intake, I am working on a couple of CAI designs but for now I decided to put a K&N stock replacement air filter in. As soon as I started the engine I could hear the difference in the air being sucked in. I hen took the car for a test drive an you could feel the difference, throttle response and power. After approx 25 miles when I come to a stop with the car in gear I feel a rough idle, when in park you see the engine shake a bit and the throttle response has fallen off a bit. Any ideas? Possible contamination of MAF or IAC? Checked for the obvious, loose connections, plug wires.