intermittent studder and bad idle

[guitaraholic]

It's an 98 S14 w/ a 98 Sr20det. Sometimes the car runs great, hits boost on time, idles smoothly, and has plenty of power, other times the car acts like it's going to die, idle fluctuates and drops down to 200 rpm, and when I get into boost it studders almost acts like it misfires and smokes a lot (black), my gas mileage is HORRIBLE, I "might" get 14 mpg and thats with a combination of the times it's running good. I haven't had time to compress the system to check for a boost leak, but the problem is so "come and go" it would be hard to think that it loosen's up to leak that much then goes away just as quickly. It does however act better when its cold.

Here's my list of mods

- FMIC
- 3" Full Exhaust
- Z32 MAF
- Chipped ECU
- STI injectors
- HKS WGA set at 9 psi

If anyone has any other ideas besides boost leak let me know, I am compressing the system tomorrow, but I am still a bit doubtfull that its a boost like problem, because its so intermittent

[180sx_Drifter]

sounds like an injector problem. check to see if your leaking somewhere. either that or something is loose.

[kdashy]

Check the MAF.