Just bought a 1987 K5. 350 TBI. Last owner says it has 112 k miles. Engine smokes a good bit when it is first started, but after 5 secs or so, it stops. Doesn't smoke again until you start it again. Any ideas on the prob? Also, service engine soon light comes on after about 40 mins or so of driving. Goes off when truck is turned off, and even if i start it again immediately, the light won't come on for another 40 mins. Any ideas on this prob? Been looking for a roll bar/ cage. Can't really find any. Do I need to have one custom made, or is there a bolt on out there I just haven't found yet?? Any help would be greatly appreciated.