here is a video, pardon the music wasnt really smart to shut it off so u guys can listen better. the thing is that while acceleration with S or no S mode, between 4,200 and 5,000 i noticed a cough of the engine retarting the acceleration, but the same thing happens while being static while in D or R, what could it be? is it the airintake, fuel filter? or sparks?

ill appreciate help plz

http://www.youtube.com/watch?v=iG2IRqi2ORE

 

Hard to tell from the Vid.
But last tune up?
How many miles?
If you hold it down and make it do it for a little while does the check engine light flash?

If so then I would say either bad spark plugs or coils or wires.

 

thnx for the reply tech,

well...i found out this morning tht it becomes more evident during recent engine start, without warming, the engine hesitates...and yes about two weeks ago the check engine turned on intermittently but it went off after deceleration..i expect to film something later and post it, also it doensnt happens only on D and R position it happens even in neutral. During the rest of the day very few hesitations, and i guess it would happen if i accelerate like the video.
the engine is 94 k, year 2000 if its nly a tune up ill go for it, i bought this car for about a year now and not sure the previous did a check up, the problem has been around for about three weeks now...i shouldnt wait any looonger

 

I would do the spark plugs first. If that does not fix it then I would say to the coils and wires.

 

ok..the prices of plugs vary from 1.95-11.95 each one, which will u recommend and how many should i buy?

thnx again

 

You need 4 of them. I kind of like Bosch platinums or of you can just get Volvo plugs.