2004 MPV sputtering issues

I thought it was bad gas at first. But after 2 new tanks, the problem still exists. Mostly the sputtering happens around 40 mph, but also higher speeds and at idle. There is no engine light on so I hear a diagnostic test will not work. Any ideas? Thank you, Burley Girl

Not sure if this will help but we have had that happen several times. The problem we keep having is ignition coils. If the coil is slow going out it will sputter and not idle very well. The last one went out last week and my wife told me that it was acting up for a week or two before it set the orange check engine light. The others just started to miss and set the light.