Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Hello, it sounds to me like you have low fuel pressure. Changing the gaskets has nothing to do with the way the vehicle runs so that is just a coincidence that it started after. So now that you have good spark plugs and you know that spark is good, you need to check fuel pressure. It can have fuel and still not be getting enough or have enough pressure to run totally. If you have good fuel pressure, the next thing I would check for is any vacuum leaks. Listen for a hissing noise anywhere around the engine while it is running, and you can try spraying carb clean around the vacuum lines and intake gaskets to see if it changes the way it runs at all, this will tell you there is a leak there. The last thing I would suggest is change the PCV valve. Let me know how this works out.
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Did you try unplugging the MAF sensor yet to see if the car will start and idle on it's own?
Let me know.