Have Ford Questions? Ask a Mechanic for Answers ASAP
what engine do you have? is the check engine light on? did you get the vehicle scanned for trouble codes?
symptoms point to a vacuum leak.
how does the vehicle run, rough? do you have access to a scanner that shows live data? can you verify engine timing? we need to make sure the timing chain has not jumped/ valve timing is not off.
if you have the vin# I can check for bulletins/ssm's for you