Thought me car had died! (edit: full story :P)

[-HSV-]

i was heading home along the highway thursday night with cruise control set at 102kmh. this bastard of a truck was sitting right on me bum for a good 20km, and then when came the over taking lane the prick decided to past. he got probabaly about 1/3 past me when my lane ended. shit i was pissed off. slammedon the brakes and let the ass whole go. got behind him and was sittin right on his ass with me stickin out a little to his right and put my lights on highbeam. because my lights arent adjusted right they pointed smack bam in the middle of his mirrors (i thought SCORE!) then i leaned over to put my fog lights on as well, yes to annoy the guy lol, and accidently pressed the LPG button. the lights all dimmed, nothing worked and all of the warnings came up in teh dash. i pulled over and im thinkin wtf? and then im like shit, it stalled... go to start it and it wouldnt start for a while. eventually got it goin again and continued driving home. looks like i was punished for pissing somone off :P

does anyone know whether this would've been bad for my car because wen i pressed the LPG button it changed it over to gas, only problem is that i've had the tank and all the piping removed...

still goes fine but i dont know whether any damage has been done.