I am looking to buy a K5 and have found one that sounds like a pretty good deal. 86 turbo diesel Jimmy - new transmission, interior good, body solid. 4 inch lift, 33 inch tires, rancho suspension, good paint, custom rollbar, highway gears, well cared for. the only problem is that it sometimes misses around 60km/hour. this happens infrequently. I tend to think that maybe the injectors need to be cleaned/replaced, or the fuel pump is worn, or it might just be a clogged filter. I am no expert, and would appreciate any info as I have very little time to think about the purchase. The owner wants 4500 canadian for it. Does this sound like a reasonable deal?