Strange electrical / tranny problem today

[Major Ledhead]

After starting my modded '99 GTP and heading down the road today I was hit with a strobe like effect from my HUD, TSC, ABS, and other dash idiot lights. It stopped blinking and flashing after a couple of miles but I noticed that it wouldn't downshift. ( no 4-2 downshift in performance shift mod either ) When I got to the first red light 15 miles later it stayed in 3rd or 4th gear and wouldn't start out in 1st gear. I could manually get it into 2nd but still no 1st. I pulled over and checked the fluid but it was full, red, and not burnt. I limped it to my destination and 30 minutes later when I started it back up it ran and shifted fine, no problems at all. Its been 2 years since all the mods were installed and I've never had any problems. Has anybody else had a gremlin like this ? Were is a good place to start looking for the problem ? These electrical problems can be fustrating. Thanks for any suggestions.....

[richtazz]

First things to check are the battery condition, battery cable connections and charging system. If they check out, you may have the first signs of a bad ignition switch/harness assembly common to these cars.