1990 Ford Bronco II - Engine

Hi, I just bought my bronco( :D ) privatley. It's been sitting for about 2 months, just because the owner bought a more economic vehicle. And with 150,000 miles on it, im a little worried about the engine. As I said, it was sitting for about 2 months, however, on the test drive, it fired immediatley, and I let it warm up for about 4 minutes. Now, when I put it in gear, when I pushed passed about half way on the accelerator, I could a pinging noise(? ), And I think its the lifters. It happened every gear, in that throttle range. Now im not that great with engines, but im not sure if its the throttle body, a broken engine mount and the engine is just shaking, if its the lifters, or it was still just too damn cold. I was planning on getting an engine rebuild kit anyway and doing it myself, but I just need to know if its something else( :evil: ). My friend said it was probably just cold after sitting. But, Any feedback would be GREATLY appreciated! Thanks! (2.9L V6 by the way, stock)