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Ok Milwakuee, change your t-stat if the temp. gauge is always low. If it runs in the middle & the upper rad. hose is hot then it's ok. Your vacuum readings sound good. Check the egr for proper operation, check ign. timing & make sure it advances when you rev it. Don't buy a tiny block heater, get the biggest one (watts) you can afford, helps your truck warm up quicker. Does the clutch on the cooling fan work right? I have seen those clutches lock up & cause an extra load on the engine. I'd put synthetic lube in the rear axle. Take it easy on the gas when the engine is cold, EFI engines dont have chokes, the ecm adds alot of fuel when the engine is cold, it meters fuel according to the coolant temp, a hot running engine can run on signifcatilly less fuel than a cold one.
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