I have an 85' C-10 with a 350....went to get ice cream one night and all of a sudden i get MAJOR loss of power....next thing you know i had to keep revving it up to keep it alive....very rough idle. i pulled over and turned it off then turned it back on but i had to keep the accelerator down to keep it from shutting off...got home...and a couple days later i took home a pcv valve and a couple feet of hoses...she started running great like before then the next day it began to act up again....im confused???