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First thing that comes to mind is a vacuum leak. Although it could be anything. I would start by getting the codes read. Since you have a CEL, that's a good indicator of where to start. Check all fuses both under the hood and under the dash. Make sure you don't have a fuse blown to the OBD II port. If it will still drive, take it to Advance, AutoZone, O'Reilly, etc and see if they can read the codes.
You say you put the car back together. How far apart was it? Still leaning toward a vacuum leak... You could also clean the MAF with MAF sensor cleaner. Don't use anything else or it could be damaged. But getting to the bottom of being able to read your engine codes is where I would start.
The fact that it woudn't rev past 4k indicates that the ECU may be in limp-home mode
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