Acceleration I have no clue whats going on with my car. I had to replace my camshaft because it broke going down the interstate,So I just got a used head from the junk yard and put it on with a new head gasket and put timing back on and new spark plugs and wires. I drove it around for a couple of days and as I was leaving I got down the road to a stop sign and I heard a pop and now when im driving it won't pick up speed. I go about 5 miles per hour with the gas pedal to the floor. If i let off it will either cut off or just idle weird. But when I am parked I can rev it up and it revs up fine. But as soon as I take off it only goes 5 miles per hour. I changed the fuel filter and I can hear the fuel pump kicking on. Any ideas?