Yep, they're right. get that sucker up to snuff mechanically speaking before doing aeromods.
I also agree that the engine is probably just getting used to its new set up. Although I wouldn't say this is the ENTIRETY of your issues, it's very common for cars to go through an adjustment period of sorts when they've had significant repairs or maintenance done.
Best of luck, I can't wait until you start cranking out some impressive numbers with your metro!
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