I know it sounds like a TPS problem but it been replaced. My 06 Grand Marquis stalls while cruising down road for a second then back to normal.
Also the car sometimes idle
s high when u first start it.
After the car is warm u can
feel a slight vibration from
engine like the engine
shivers. Replaced air filter
cleaned throttle body and
replaced tps sensor per the
Also cleaned maf
Did you clean the Idle Air Control Valve also ?
Don't have one
Are you sure? Sure sounds like the problem. No IAC on an '05? https://www.youtube.com/watch?v=ayjhL9jpFH8
Did you change the Ambient Air Temperature Sensor ?
Looking for a Used Grand Marquis in your area?
CarGurus has 2,148 nationwide Grand Marquis listings starting at $1,985.
Search Mercury Grand Marquis Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Mercury Grand Marquis Experts