I posted your info needed in the other thread you posted. Boom.

 

After reading this post, I'm really thinking I need to change my spark plugs, because my car doesn't stutter at WOT, but it stutters at freeway cruising speeds every now and then. It almost feels like fuel cut but I'm not sure, I've never felt anything like it in any of my other cars.

 

Are you running e85? e85 can clog up your injectors and cause your evo to run lean and stutter, if that is the case, have them cleaned every 5k miles.

 

Are you running e85? e85 can clog up your injectors and cause your evo to run lean and stutter, if that is the case, have them cleaned every 5k miles.

 

Everyone always forgets.... Dude is your stupid A$$ fuel pump relay..

Link

Another Link

 

Mine does the same thing. I had a GFB BOV and it was really bad in 5th at 65-80. I put the stock one back on and its better now but still get a stutter every now and then. Guess I need to check my plugs.

 

I changed that relay like two weeks after I bought my car haha. First thing I purchased

 

Revivng to see if OP found resolution as I am in the same boat, replaced the FPR to the new(er) green one and its still same thing

 

Not really. What fixed it is it got warmer. I think the boost was spiking, causing the ungodly thud sound.. That, and maybe the v201 map. The FPR swap helped a little initially, but then it resurfaced. If you're in warm weather, I have no idea what to tell you. Log it, look for a lean A/F, watch the boost. The v400 peaks at 29, so it already sounds ridiculously high, but it shouldn't be more than that. But as for a specific cause, if it gets cold again and it starts up, then the cold messing with the A/F will have to be the gremlin. I pound on the car daily, and since it's been above 45, all is good. Let me know if you find something different.

Best, Dan