Toyota corolla ke 30 4k vacume hose setup

Describe the engine code.

Not likely, inspect engine for loosen vaccum/air hoses.

Toyota corolla e30/e35/e36/e40/e50/e51/e55 wiring diagramme

what type of ford what year

Easiest way to find a vacume leak is to get some soapy water in a spray bottle and when engine is running look for any appearing bubbles that would signal a leak. All vacume hoses are simular in looks black rubber ranging in size from pencil to thunb in diameter. Vacume leaks are time consuming to repair and occasionally frustrating just be patient and listen with your ears.
A diagram will be in a haynes or chilton book for your year make and model you can get this at almost any auto parts store.

renew the engine oil,and check it!!!

yes its an unleaded gas engine.

possible check vacume hoses if its hookup properlly

You will find what your looking for here. free and with real pictures!!! got a few you can check out but use the first one first
http://yotatech.com/f116/code-71-vacuum-lines-140356/
http://www.yotatech.com/f116/vacuum-hose-routing-diagram-179866/
http://www.yotatech.com/f116/vacuum-hose-routing-diagram-179866/
these will help you a lot, they helped me out with the same problem