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We would need more info to give advice.
I doubt a clogged cat would cause the problem.
Have you checked fuel pressure, can you raise RPM in park, and does the engine die suddenly when you shift into gear ?
run fault codes first .Check for faulty o2 sensors and check the air filter is clean. Check fuel pressure in the rail. check for blocked exhaust system (cat converter) check for correct tyre pressures and check the load carried and the speed being driven at . Check that the od is operational and that the motor is not over reving at speed this car in proper operating mode should be around 6ltrs per 100 klm's travelled
ok so much done owell next is the mass air flow to be checked then the fuel regulator to check pressure and the fuel pump for pressure and then check the cat,s for back pressure wood be my next thing and Last is the how many Km,s does it Have ?sounds like filter needs lookin at in the tranny if she,s got High Km,s if not then check the intake for leaks it,s Plastic so don,t hurt gone this far Let me Know What Happens,s Thank,s
check air filter, might be plugged, [dirty so engine is starving for air.] check fuel lines & filters, dirt blockage need replaceing, check for fuel leaks in lines etc, uses fuel & then sucks air causing it to stop, listen to see if fuel pump is running properly & not stuttering could be short in it's wiring
I would replace the fuel filter(every 35000 miles),check the condition of the air filter and check out the catalitic converter and feel the tail pipe to see if the flow seems clogged and weak when some one else gives it the gas.
My 2001 had to have a new cat at only 44000 miles. I had them install a "High Flow" type.