Does anyone know where i can find the proceedure to check my coil packs? Resistance values, what wire ect?

It's a '98 4.6, with a skip/stumble/shudder most noticeable at 1500 rpm under load, but happens pretty much all the time, and in any gear. Started out slight and has grown in the last week to where i've parked it until i fix it.

No check engine light, and not plugs or wires.

Thanks.

 

If it is consistant at a certian throttle setting then you could also have a bum TPS.