Spark plugs

Your plugs in that car should be good for 60,000 miles. as for performance plugs, i would suggest using what the factory calls for. Here is a guide to help walk you through the job with diagrams below to show you how on your car.

https://www.2carpros.com/articles/how-to-change-spark-plugs

1.02 mm (0.040 in) gap

Spark Plug Type .................... GM P/N 12591131 (AC Delco #41-100)

https://www.amazon.com/gp/product/B000IZ3MPC/ref=as_li_qf_asin_il_tl?ie=UTF8&tag=2carprcom-20&creative=9325&linkCode=as2&creativeASIN=B000IZ3MPC&linkId=7cfb46aea11c8ba2f5a7d391aa5e698d

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Remove the two top motor mounts (Dog bones )then get a ratcheting tie down to tilt the engine forward. Then remover the plugs and out them back in, still tight but at least theres some room

Check leads are fitted correctly and pushed all the way home, have you just got any fuel? At night go out and start engine and lift bonnet, watch for any ignition spark arcing to earth.

The description sounds like it could be almost anything. From a plugged exhaust system, bad fuel pump, bad fuel regulator, EGR stuck open, purge solenoid stuck open and more. It needs to go to a shop and have it actually scanned and some diagnostic tests performed. The other option is to spend a bunch of money swapping parts until you get lucky or go broke.

You didn't post which engine you have so that also hinders the process.

0.060 Here is a guide to help you see what you are in for when doing the job.

https://www.2carpros.com/articles/how-to-change-spark-plugs

Please let us know if you need anything else to get the problem fixed.

Cheers

Chances are your valve seals for that cylinder is cracked, if that isnt it then you will probably need new piston rings.

Are you sure the wires are on the correct posts on the cap. You might have retarded the firing order

The plugs are at positions 5,3,1 and 2,4,6 at the bottom of each side picture, pull number 1 wire off the top of the number 1 plug using a spark plug socket, unscrew plug from head .. screw new plug back in hole ... taking real care not to cross thread .. re-clip wire back onto plug .. repeat this for every plug .. do not mix up wires .. or your firing order will be wrong ..

Remove the plug wires from the plugs, then remove the spark plugs from the engine with a 5/8 inch spark plug socket. (engine needs to be cold)

If installing the spark plugs to an existing cylinder head tighten the spark plugs to 15NÂ m (11 lb ft).

Notice: Be sure plug threads smoothly into cylinder head and is fully seated. Use a thread chaser if necessary to clean threads in cylinder head. Cross-threading or failing to fully seat spark plug can cause overheating of plug, exhaust blow-by, or thread damage. Follow the recommended torque specifications carefully. Over or under-tightening can also cause severe damage to engine or spark plug

Note: Use only AC Delco spark plugs. Do NOT use Bosch plugs!