loss power issue
 

ok ill start, i went to dealer for few cels! fixed everything up. new plugs, new wire, new coils, brand new mazdaspeed cai, brand new cat, check the compression everything is good! but in the morning when i start the car it runs like on only 1 rotor or whatever u call it then a few days later i started to have power issue on highway when i hit 7k then power comes back up to 8k then loss of power for a few second( like the engine cannot take enough air or what so ever) then after 8900k it ok! it feels like the rpm between 6k and 9k is having a hard time to go up for 1 second then its ok!

no cels yet apart 1 day ago i had evap code! i check the gas cap and no m ore cel after

How is it running now? How does idle? Have you reset the ECU? Please give us the history on your car. The service it's had. Type of driving it gets(long commutes, short trip), fuel used(reg or prem), ever flooded, mods installed. Have you ever run any engine de-carbon cleaner to improve compression? You might need this to clean up the carbon buildup from a lot of short drives and not much red lines. Just any thing that you can add.

carbon clean up done! run on 94 gaz all the time, ecu reset, idles good, only mazdaspeed cai! still have hard time to rev up to 9k! never flooded! i drive half city/half highway! from the dealer nothings wrong but theres is something wrong! i was thinking of MAF but it does not cel! f#$k i cannot find the problem! i looked if vaccum hose were not loose but everything is fine! im gonna remove the cai tomorrow and see how it does without the cai! just remove the bottom part!

What year model and miles driven.

2004 118 000km

When you said you went to dealer did you mean they did all the work too including CAI?

yes

engine change under warranty :)

Either engine or stuck valve

How long ago did you get this work done? Might it still be under warranty? Call them and say it's not right. You might have to leave over night so they can start in the morning.

engine change under warranty its a 2004 with 120000km! there was prestone on spark plugs! low compression when cold would cause misfire at cold even with brand new coil,plugs and wires!
im lucky here in canada its 7years/160000km full warranty!