Tennie

I have a 07 chevy avalanche vin3 that has had the afm system deleted by a gm service tech and just the other day it drove down the road fine and jerked then lossed power and started to give me a major valve rattle like the top end of motor has no oil pressure. I have and maintain 55 to 40 psi oil pressure and when starting ask like it is flooded checked codes and only code I get is cam and crank correlation but clear and does not come back