Hello everyone on the forums I have a problem and was wondering if anyone had any ideas or suggestions to the cause.

I changed the spark plugs one day and the car began to sputter at idle and seems when I get on it the car goes fine at times, I read up to buy some BPRE8 plugs and gap at .22 and I did and didn't seem to fix the problem, I got boost leak checked and it didn't have one at the time I bought a spoolin up COP kit and that didn't seem to tone it down... Likes to idle around 600-1100 rpm but sputters like it's a simple misfire.... I am clueless to wats wrong

Just recently got a exhaust manifold leak I need to replace. Do you think that's the problem? Looked at the plugs seem to run little more richer than normal but not sure the problems

Any suggestions pls!!!