Check Engine Light?

The motor that opens and closes the runners at certain speeds for optimum performance.

First, you need to list the exact fault code number. There' are a lot of codes related to the EGR system, and they mean very different things. Second, no fault code ever says to replace a part or that one is bad. They only indicate the circuit or system that needs further diagnosis, or the unacceptable operating condition. When a part is referenced in a fault code, that part is actually the cause of the code about half of the time. First we have to rule out wiring and connector terminal problems. Also, be aware the EGR valve itself is not what is monitored. There can be a position sensor on it that is monitored, and flow through the valve is monitored. That means you are just as likely to be looking for an electrical problem as well as a mechanical one.

As I said, it is just as likely to be an electrical problem. You replaced mechanical parts. You have to know the exact fault code number. There are a couple dozen related to each of those systems and they mean different things with different diagnostic procedures. If I were to look at different intermittent fault codes that set at different times, I would start by looking for wires both systems have in common. Typically that is twelve volt feed wires to actuators and five volt feed wires to sensors. There will be splices in the harness that are just ripe for corrosion and intermittent connections. Connector terminals can develop a light coating of corrosion and cause intermittent problems. The fault codes can differentiate between a sensor reporting a defective condition verses a defect in the sensor circuit. Think of that as the difference between a security guard reporting a broken water pipe verses a security guard sleeping on the job. Neither condition is good, but they are quite different.

It sounds like you have developed a sever misfire condition. Your first step is to get the codes read from the check engine light as they should identify which cylinder has the problem. They have a lot of problems with individual coils getting too weak so you would likely be looking at a whole set of plugs and a coil in the offending cylinder/cylinders.

Have the computer scanned to identify trouble codes. Most parts stores will scan it for free.