im looking at buying a 90 burb with a 6.2. he says it did run but now won't start. he thinks it is something electrical because the glowplug indicator isn't lighting up. i can get this cheap, the body is great, little rust for michigan, the only problem is the 6.2 (that i know of so far). id like to fix this up for a DD. i know nothing about diesels, is this an easy fix? maybe a glowplug controller relay if there is one? edumicate me. also its a 2wd 1/2 ton with 235/75r15 tires and probably 3.08s, any idea what milage it would get?