I changed the spark plugs and now it sounds like a helicopter

You can fabricate a tester from a 6 inch long mongol pencil. Sharpen one end and drill a 1/8" hole in the middle. Now remove the sparkplug wire from each sparkplug and insert the pencil onto the sparkplug wire with the dsharpened end connected or touching the ground or any metal part of the engine. Start your engine and you should see sparks jumping on the drilled hole on the pencil which indicates that your spark plug wire is okay.

Oil change 5W/30 and Wynn's thin oil in crankcase . One bottle injector cleaner .to Gas tank .

could be bad plug wire try unplugging them one at a time and starting it if u unplug one and star it and it sounds the same if its plugged in its a bad wire

sounds like a wire is crossed, not making good contact, or plugs are gapped wrong...check all your wire connections..did this help?

Could be a missfire in the engine, most likely cause spark plug or wire B/O. To check for spark plug wire look under hood in the dark to see if fire is arcking from wire to motor. To test for plugs start motor and disconnect one spark wire at a time, use insulated rubber gloves and be carefull not to burn yourself. If the motor does not change sounds, likely that spark plug is ok. replace that plug wire and try with remaining plug wires. If your vehicle has more than 60,00o miles it would be a good idea to change plugs anyway. Just make sure that the electrodes are guaged to the proper width

for a start leave the battary connected then remove one spark plug lead and plug at a time that way u wont have a problem

you may be getting water on your computer leads. something is getting wet. check all spark plug wires. take off 1 spark plug wire at a time as engine is running replace if no change in sound. if you have a bad plug or wire this will be the best way to find out. should be an easy fix.

I would take the valve cover back off...It really sounds like something is under there. I have seen people leave sockets in there before. Also take the plugs back out and see if you can look inside the cylinder for a piece of the old plug. Also try using a telescoping magnet avaliable from any parts store....

Sounds like no spark. Possibly bad coil or bad ignition module.

The dielectric grease simply makes the plug wire slide on the spark plug more smoothly (creating a better connection) and helps remove it later without destroying it. Wires should snap down and you may be hearing the arcing coming from one of the wires. If 'ticking' is the sound try looking at the wires closely while running in the dark. You may visually see the spark and you answer. Spark plugs are usually hand torqued but a torque wrench is never a bad idea.

If still no luck then I would suggest switching out plugs & / or wires with you old set to see if the problem disappears.