bajaboy169

Checked the wires they are good can't pull the plugs till I get to work tomorrow plug socket at work.

miata25psi

Check everything related to ignition first. If it threw a coil code it's could be wiring, intermittent ecu issues, or other randomness.

bajaboy169

plugs look great clean and tight at .032 reset the light cleaned the air filter. fired it up test drove. A little different now if I am easy on the throttle it responds good till around 4000 rpm. If I gun it half pedal it is missing and the engine light comes back on. #3 miss fire I pulled the plug again cleaned it unscrewed to cap on the plug 1/2 turn to insure good contact. reset the light test drove again same as described above.

Erat

iTrader: (5)

I think you found your problem. It seems to just have a misfire on #3.

pdexta

iTrader: (17)

I'd bet that spending $8 on a new set of NGK BKR7E (part #4644) spark plugs would fix the problem.

sixshooter

iTrader: (12)

Fouled

bajaboy169

Sorry had to go out of state for a while. Pulled the plugs they look great perfect gap good spark. Checked for leaks no leaks . next?

sixshooter

iTrader: (12)

Plugs can look fine and be fouled. Buy plugs.

bajaboy169

Ok I have $10 I will get them when the snow melts in a day or two.

bajaboy169

Sorry had to go to Texas, just got back. Alright different symptoms now when cold it runs great for 10 seconds then if I feather the throttle lightly it performs as it should including the turbo. If I gun it, it bogs down. Any suggestions on what it could be? I checked the wires and plugs Thanks

sixshooter

iTrader: (12)

Fuel pump. Or metering problem.

bajaboy169

No it doesn't lage at high rpm if I am light on the throttle

sharkythesharkdogg

He's suggesting you may be getting enough fuel at idle, and with gentle throttle input, but when you give it more throttle input the stumble comes from there not being enough fuel getting introduced into the mixture.

Check fuel pressure when you're doing these throttle input experiments.

sixshooter

iTrader: (12)

And still change the ******* spark plugs even if you think they look fine.

bajaboy169

yes six shooter I change the f****** plugs!!!!

bajaboy169

Thank you for all your help it turned out that I got a bad coil from the factory brought it back to advance auto parts replaced it with another new one and all is good.

sixshooter

iTrader: (12)

Yay!