Hi all,

I was hoping someone amongs you may have experienced this problem.

I drive a Mazda 3 2009 Sport GX. 2.0L Automatic.

I have had the car for a year now, I changed the transmission fluid from Mister Transmission last may. I do my oil changes very regularly and use non synthetic oil.

Recently (the past 3 weeks) I noticed my Car was sluggish to accelerate. I had the spark plugs changed ( to OEM Mazda Iridium ones ).

now the sluggishness still has not completely gone away. City driving is fine.

On the Highway, on the 4th gear the RPM goes upto 3000 then drops instantly to around 2500. Then I have to push more gas to get the RPM up and it refuses to go above 3000rpm

I have been driving this car for a year now constantly on the highway so any difference in performance on the highway I notice. I feel it is taking the engine more work to do now.

Any idea anyone what maybe causing this ??

Thanks in advance,

Much much appreciated