sometimes when i try to turn on my car...it wont start...it will but then it atomatically turns off, and then wont start...but i learned if i just wait like a couple of minutes..it starts rite up with no problem, my cousin and i think its the Main Relay, what do you guys think?

and as for the IACV...i was wondering if i can just replace the screens that are on it? can i?...please do tell.

and if anyone knows how to read the timing gun please do tell? i want to get one to fix my timing! its WAY OFF! by 9*...so i am just eating gas like water! any help is appreciated