99' zx2 stall when blinker used

I'm really stuck here. Sometimes when I'm driving 60-70mph for a while and use my turn signal(it happens in either direction), the engine stalls, then starts right up again. The engine light pops on but doesnt stay on so I cant pull a code off of it. I took it to the dealer, but they dont seem to have a clue. I also have a rough idle, but the dealer says thats "normal" in zx2's. Please help.

sounds like there is a nasty electrical prolem there, check all the wireing under the dash for any broken or freyed wires and trace them back from the headlight to see how they look