it is a GMC '89 chevy 1500. manual tranny, efi. now this truck worked fine just a half hour ago, and everything was normal. but now, it will not start. my dad said that when you tried to accelerate, it would jerk, like it was not firing a second, than go back to normal, and happen again, it died just as he got home. I have already started trouble shooting, and am assuming that is has good compression. the first thing I did, was guess that someone had syphoned gas from the truck overnight (it is parked in a local construction companys baseyard) and that the gas gauge was broken or stuck. I put in two gallons of gas and tried starting it. before you ask, I have been trying for the last 10 minutes to make sure that gas was pumping through the fuel line. now to me, I think that is sounds like it is not getting any spark, it will just crank, but will not start up. is it possible that the efi ground wiggling loose could cause this? do you know where the efi ground is located so I can check it? my other question, is what is a safe way of checking the spark plugs for spark? I am assuming that the charge is much larger than I lawn mower engine, and don't want to get electrocuted. thanks. chris.