I have an 05 town and country touring with 177000+ miles on it I changed the spark plugs this summer and had good power after that now when you try and go over 65 mph it dogs out in power.

anyone with any ideas what could be wrong or places to start?

 

First signs of a weak fuel pump. Might start with a pressure test.

 

How would you go about doing a pressure test and what equipment is needed?

 

Sign out a fuel pressure test gauge from an AutoZone or the like and connect it to the fuel rail test port if equipped. Start it up and you should see a steady 55 psi or close to it. You may have to rig it up so you can drive with it connected. Short of all that connect a scanner capable of reading real time data and drive around with it connected.

 

The check engine light is on also with a code that says its the ERG system could this be part of the problem with the response of the vehicle? Thanks for the info you have given so far..

 

You bet it could. If the valve is stuck open it's a vacuum leak. Common cause of performance issues.

 

Thanks I will have to buy one and replace it

 

First which code is it? Could just be a plugged vac line.

 

I would have to have it hooked up again it's been a few months since I had it hooked up last.

 

All you need do is put the odometer in trip mode and flip the key on ( not start ) 3 times and read the code. if you miss it off and back on ( 1 ) time and read the code again.