i just bought a 92 blazer with the 4.3 tbi it was a dnr truck so i know it was mantained well its got 160,000miles on it my problem is that when i fire it up its loader than hell it idles quiet and drives quiet its just when start the ting ive own alot a vehicals and but none like this i was woundering if i got a problem brewing or if thats just something to live with