Engine light on/off rough acceleration

Are you sure you replaced the plug wires correctly? As for the engine noise, is it overdue for an oil change?

Could be bad EGR valve or vacuum leak. Egr valve, depending on whether it is stuck open or closed can act like the old choke thermostats on the carburator system making the vehicle run and idle rough when it is cold OR hot but normally only one or the other. Will run fine cold but rough once it's hot or rough when cold and fine when hot. Check or have someone check for any trouble codes in the system. It can hold codes and not make the check engine light come on and may help diagnose the problem.

No idea here no experiance but try asking at the dealers as it could be something simple like a oxygen sensor failure as these older cars are not electronicly loaded

Read Memory Mode : used to pull codes which have been stored in memory. It is most effective in detecting poor contact of wiring harness connectors. To enter this mode, connect the read memory connector with the ignition ON . D Mode : used to diagnose and test the entire injection system. To enter this mode connect the test mode connector with the ignition ON . On the Legacy and SVX, the ignition must be ON with the engine running. F-Check Mode : used to measure the performance characteristics of the injection system components. When working in this mode, a Select Monitor or equivalent scan tool is required. U Check Mode : operates during normal engine operation. It signals the driver using the MIL only when components necessary for start-up and drive are faulty. The read memory and test connectors must be disconnected with the ignition ON for this mode to be operational.

Sounds like throttle position sensor is not working properly.



Good luck

mai

fuel filter or fuel pump

its all in the name

No the timing belt have been well replace or else the won't start.Well the timing must be check with a timing light and do the adjustment if necessary

replace temp sensor for the emission system. there are two on the engine.