ticking/rattling sound

[gysm715]

Hello. I have been trying to search all day for the answer to this problem with no luck. I have a 99 K2500 4x4 crew cab with a 5.7. I had the engine replaced last year and have about 11K on it now. The place that put it in did a lot of shady work that I had to correct. Well ever since then it has never ran right. The newest thing is when I pull out from a dead stop there was this ticking/rattling sound that would go away when it shifted. It would also make this sound when I was going up a steep hill and it down shifted. I took it to a tranny guy and they said the tranny was great with no problems. So I took it to another garage to check the cat and that was fine but he did notice a miss. So I changed all the plugs, wires, cap, rotor and coil. Found the coil wire was burnt on the inside. After I changed all that the SES light came on. I hooked up my OBD II and got the standard P1345 I tried to erase the codes but the light kept coming back on. It would run great with no hesitation, so I took it on a long 400 mile drive and it ran great the whole way, maybe a little sluggish on the hills.

Last night I noticed that it would make the sound when I reved it to about 1500 rpm. I could not tell where it was coming from. Then this afternon I started it and it now does it as soon as I start it. It will then go away when I rev it hard. Could it be pinging due to the dizzy being a tooth or two off? Any help would be great. I am trying to sell this truck and hard to sell it with a SES light on.

[gysm715]

Any ideas? The noise seems to be coming from the tranny area. Maybe the trq convertor.

[79403ta]

make sure the torque convertor bolts and cover are tight and while you are under there look for electrical plugs that arent plugged in

[kfrog001]

Check your rockers and valve heads. I had one that the valve sleeve had broke off and would vibrate and rattle. Also check your flywheel for cracks