Spyder 1999 Eclipse Spyder GS 2.4l engine issues

[BeaterCarGuy]

So I've had this car for about a year and I'm having it looked at. Story with it is the previous owner didnt know what was wrong with it because it stopped working correctly. It sat for 2 whole years and a lot of parts needed to be changed out.

I've changed the following spark plugs, coil pack, valve cover, oil and filter, air filter, fuel filter, fuel pump, MAF sensor as well. Managed to drive it home but it was terrible and risky as hell as I will show you. If anyone can tell me what's going on with this please all advice is accepted.

The car ran good with the MAF unplugged and ran terrible while plugged so I replaced it with a brand new one but still when it runs cold it's fine when it runs warm its terrible I have a video of both of when it's cold and when its warmed up and runs like crap.

 

[DogWhistle]

Ours had the exact same symptoms, and it turned out to be the secondary fuel pump relay starting to fail.

Here’s the article on how to bypass it:
https://www.dsmtuners.com/threads/4g64-spyder-gs-fuel-pump-relay-module-bypass.497574/

 

[BeaterCarGuy]

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[DogWhistle]

A little different than that. It ran, but rough, for about 2 minutes, after a cold start, and then it would die. It ran after it was warm, only if we unplugged the maf, as you described.

Although there could be other things causing your badly running engine, you should bypass the secondary fuel relay just to rule that out as a problem.