what would cause my motor to shake

1999 FORD F-150

16,500 MILES

AZFIREWOMEN

under load thr motor shakes but smooths out about 65mph. there is a hissing sound at the back of the motor and the service motor soon light came on.

Jun 12, 2012 at 11:04 PM

ASEMASTER6371

there is an elbow for the pcv valve on the back of the throttle body that collapses and causes this condition.

Roy

Jun 12, 2012 at 11:16 PM

RASMATAZ

Sounds like Mr. Roy is on the money here-Excessive false air leakage-Scan the computer for code/s, lets see what it has to say

Jun 12, 2012 at 11:40 PM