I got a 2006 Colorado 3.5L I5, it’s got 183k miles, I replaced the spark plugs and mass airflow sensor today. I did the MAF first and started it after and it ran fine, but after I put the new plugs in, it started misfiring real bad. So I pulled them back out, double checked them and the coil packs, and everything looked fine. I put it all back and and started it, and it was still missing pretty bad. I took all the plugs out and put the old ones back in, and it still was missing bad, (it ran smoothly before) I need help. Cheap fixes if possible.