OK, here's a dumb question. I figured I would make an attempt this week-end at getting rid of the pesky "check engine" light of my '89 TBI K5 w/ 172k miles. Changed the oxygen sensor, plugs, and wires for good measure. Now she runs like crap - shakes and hesitates terrible The only thing I can think of is that I put a couple of the wires on wrong. What is an easy way to make sure I got the right wires on the right plugs? Also, would it run as I descibe if I did flip two wires? Any other thoughts would be much appreciated - gotta drive it to work tomorrow! Thanks.