Recently I had the spark plugs, oil filter, upper intake gasket, changed. on 2001 Ford Escape

Now my car is having trouble picking up speed and when I step on the gas pedal it makes a loud screeching noise even when I just start the car it still makes rough idle and whistling and screeching noise and won't go higher than 20mph. I tried to drive, but I started to smell gas so I parked it. Please help

by in Kent, WA on August 07, 2013
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1 answer 2 comments
ANSWER by , August 07, 2013
could have a vacuum leak. also, these were bad to have the catalytic converter to stop up. probably need to go to shop to be checked. converters made on exhaust manifold.
COMMENT by , August 07, 2013
I am curious to know why I had no issues with this before changing the spark plugs and the upper intake gasket. Is it possible that the mechanic did not do his job right?
COMMENT by , August 08, 2013
can't tell ya if job done right. could take it back, if you trust they will correct any problem they may have made doing their work.