I replaced all filters... gas, air, oil, transmision and feel a bumpy idle,,, I wonder if the next thing are the spark plugs??

plugs and wires might be a good idea, sometimes its just wires, sometimes just plugs, sometimes both....usually a good bet to replace both.

Clean the throttlebody! That cured my lopey idle 100% It also cured severe hesitation at stoplights.

All good suggestions so far. A quick free test to start with would be to check the ohm reading between the posts of each coil pack. This is done with the car off and cool.

All the readings should be reasonable to one another. For example if 2 coils read 5.26 and 5.43, then the last reads 8.24. This could cause a poor idle.

Like stated above, bad plugs and wires are the typical first causes of bad idle.

take the car out on the open road, get up to crusing speed, 65-70 mph....

VERY SLOWLY ease into the gas pedal, you dont want it to downshift, as youre easing into it, if it starts to vibrate alot and miss and generally just have a fit, then its definetely ignition related and most likely wires....at least that was sure as heck the case on mine, this little test works even better going uphill.

Bill Boost can you explain exact steps to measure ohms on coil pack,do I use multimeter and where do I touch points?

This is the thread on checking coil resistances.
http://www.bonnevilleclub.com/forum/...ic.php?t=44493

I have the 3 square pack coils on 90 sse what kind would these be?