Hey guys i have a question. i have a 02 tahoe 5.3 my son was supposed to use seafoam thru the brake booster line but accidentally grabbed the berrymans b12 and ran half a can thru the booster line. i did the ole italian tune up hoping id get it out as soon as i could but it shut off once while coming to a stop sign and when restarted had a big puff of black smoke. seems to be running ok now but im panicking do you think he damaged anything? is there anything else you guys can think of i should do? thanks