looking at buying a lb7 2002 160k. original owner, older gentleman, garaged kept. serviced every 5k since new by the same local shop. never any serious problems. He said when it idles for a while it'll puff 1 puff of smoke then its fine until it idles for awhile. No leaks, truck is clean. What do you all think? how much should I pay? Do you think it'll need injectors? Also do they have any head gasket issues or any other major issues?