My 2004 Santa Fe had he check engine light come on several times in the past week. It started to run rough, like it was going to stall, then the check engine light came on. I took it to a mechanic. First, the code was for the wires, which were replaced. Later that day, after it was fixed, it started doing the same thing and the check engine light came on again. Then the mechanic said it was for the engine coils, which were both replaced. 2 days later, the car stalled on me and the check enging light came on a third time. Now the mechanic said the code was PO 335, or the crankshaft position sensor. Is there a glitch?

Impossible to diagnose without the trouble code.

The Ford Escort ZX2, the 2.0 liter is a interference engine,The valve and the piston kissed each other as they met with a broken timing belt,Just to let you know a cam position sensor does not create rough idle, it can stall the engine at a stop sign,but the solution is a valve job, and who ever put the timing belt on after the job should have done a cylinder effeciency test.

Millions of people around the world, have all kinds
of problems, with all kinds of vehicles,at least once a year

That is a common EVAP Code for a Vent Control Valve
or circuit problem

Most likely the valve is letting in air under certain conditions
& leaning out your fuel mix,thus misfires & running rough

It is an unmonitored source of air entering the intake

If you can find it ,most likely under the rear of the car,
you could change that one valve

That is not the way to diagnose, but you may get away
this one time, if you want to chance saving money at
a repair shop. No guarrantee that is the isssue.

It seems Kai & Hyundia (asian vehicles) have a high rate of evap issues
vs; the big US three

Po448 --is an EVAP Code for the Vent Control Circuit

shorted solenoid or something

P0000 ?

Try another place. Independant garage. Conveters don't make the engine race

it is probably going into a fail safe mode, get it to a dealer and have it scanned for dtc's

do a compression check, its possible this is a mechanical failure.

Does the Check Engine light come ON when this happens? Whenever the "Check Engine" light comes on, there is always a DTC (Diagnostic Trouble Code) stored in the ECM (Engine Control Module). You'll need an OBDII (On-Board-Diagnostics) scanner to retrieve any codes recorded/set in ECM. Once you do this and let us know what, if any codes are set, then we can go from there. What did the dealership tell you???? NO trouble Codes?

Your ECM may have a poltergeist.

have you had fuel pump checked?