Weak spot on these trucks is the VP44. Make sure the stock lift pump is supplying adequate fuel pressure to it (10 PSI minimum). Also make sure it does not have a #53 block as they can be problematic. Other problem is sloppy steering which can be fixed with a steering stabilizer and a 3rd gen track bar kit. Check for codes by doing the key trick (on off on off on and any codes will appear in the odometer window). You definitely do not want to see a P0216 among others. Auto trannies are weak IMO, but totally acceptable once beefed up. Good luck.