Well heres the deal, the car didnt run incredibly smooth or anything when i put it away, but it seems pretty bad since i took it out of storage. Heres what ive noticed, It surges occasionally while idling, runs really rough at certain RPMs and smoother at others, (ex 75 MPH loud and rough, 80mph a lot smoother) its not consistent i think that it runs better when the car is cooler. Also i noticed last year after my Mac Mids were installed that if it were running in park for a while there would be black marks on the cement under the tips someone told me thats a sign of bad o2s. Any help would be appreciated. My mods are mac mids, no cat, loudmouth, CAI 160 stattrickflow elbow airfoil.

 

the black marks would most likely be from not having a cat anymore (unburnt fuel/carbon), although if the O2s were bad you could be running rich and it could also be partly because of that

it also could be the gas, did you put any fuel stabilizer in it when ya put it away?

besides that ya got me unless its the opti starting to act up...

btw, if this is you Tony hi, its Kyle

 

It could be a bad egr too....I believe shoe box's website tells how to test this

 

i'm gonna vote for bad gas

pump it out and replace it.

change all the fluids and check the plugs and wires.

i know it seems dumb...but have you checked the engine bay? i've heard of animals making homes in cars for winter and nibbling through wires and things liek that.
you never know

 

Well the plugs were just changed in August, and the EGR was removed at the same time as the plugs. Also i thouguht id mention, the SES light comes on occasionally then will go away, or sometimes i have to turn the car off and on and the light goes off. I took it to autoizone, and they said it wasnt throwing any codes.
And hey kyle whats up this is Tony, ill give you a call sometime when i get out of schoool and we'll go over to Milan

 

Oh also in regards to the fuel stabilizer, i did put some in but ive already gone through a tank and a half of gas, so i kinda ruled that out

 

you may have fuled your spark plugs and o2 sensors from a.)Bad Gasoline b.)a ton of oil seeping through the valve seals becasue it was stored, murder on plugs c.) check your fuel filter, add some injecter cleaner

 

Could the Opti have gotten some moisture inside? Just a thought...