i was driving my fd and she was running fine. i was getting a 18-19 vac and then suddenly the vaccum went to about 12-14 and now she idles really weird and acts like she wants to die. i changed my spark plugs cause they were alittle old and still no help. vac is steadier but still not right. i'm thinking the engine is gone but should i check something else before? i'm planning to check the compression tomorrow to see what it is.

 

COMPRESSION check. thats the best u can do before u even make a thread. after that then you should post whats going on.

 

list of mods?

 

i have a koyo, 3" dp, apexi n1 single tip and everything else is stock

 

+1 on the compression test. were you boosting or all of a sudden the vacuum just change. look for anything loose under the hood. does it backfire a lot when you step on the gas? Good Luck!

 

yeah she backfires alot now. i wasn't boosting when it happened but i'll give an update in the morning on the compression numbers. what numbers should i be looking for on the compression?

 

a piston compression test or rotary one? if your gonna use a piston compression tester, check out this link.

http://rotaryresurrection.com/3rdgen...ion_check.html

http://rotaryresurrection.com/3rdgen..._symptoms.html

 

check your MAP sensor... that sounds like it got unplugged.

 

map sensor is fine. couldn't get a compression test done today because the starter decided to go out and wouldn't crank over. i'll try again tomorrow