2 days ago it was cold out and started the but stalled 3 times...never had that since i bought it... now when it starts its missing but i dont lose power or anything... it got its tune up in march... its a 4.3 vortec 2wd, with 263000kms...

thanks for helping

i just need a general idea before bringing it to the garage

Flashing light is a engine miss or pcm shuting down to save the cat.
Better look for the engine miss.