Afternoon, havent come across a post already so if its already been answered, please direct me..but my 03 silverado has started running rough, but its not everytime. And when its one of those times, i noticed that the oil pressure drops down to about 20 when im at a stop and then as i accelerate it goes back up. I dont know if its normal and i just never noticed it, or what is wrong? Any ideas? Thanks yall.