The engine has problems; when the engine is put into gear it becomes loaded but does not have the power to support the load at idle. Have it scanned for possible faults/codes, run diagnostic on the engine, and/or tuning it up may help.
Is your clutch bad or wearing out ?
what causes a boat motor 40 hp to stall when it is put in gear
If you mean each time you engage car in any gear forward or reverse & it immediately stalls - you have a bad torque converter. Start engine, put foot on brake, put car in NEUTRAL, if it DOES NOT stall, but it does stall if you repeat this test when you put car in drive or reverse = bad torque converter - It's called a "stall test"
torque converter or solenoid problem most likely if it runs out of gear ok.
because you are engaging the clutch which cuts out the engine for a smooth gear change
It could be that the torque convertor is locked and not slipping which it should do as the normal operation
transmission, I'm afraid--may be able to coax t a bit by gently revving engine, kryword gently. :-)
A motor will die when put in gear if there is a major vacuum leak. This causes an excessive amount of air to enter the engine and lean out the fuel mixture.
There is a huge problem with all Ford Focus, there seem to be a problem with vehicle's computer. If you consult the Technical Service Bulletins about engine stallin, it will tel you that your car's computer need a recalibration procedure, which, needless to say, it costs a fortune. Your dealer will know.
Here are some possible causes: 1. Warped flywheel. 2. Engine out of time. 3. Engine misfiring.
it sounds like ur clutch went out in it.