boost leak? spark plugs? help diagnose my problem!

[hungryjoseph]

it's an s13, with s14 sr20, lightweight flywheel, stage 2 clutch, 11lb driveshaft
I was just driving normaly today. I merged onto the beltway, and when doing so, I put a little more than the ussual load on the pedal. The car became jerky around 2800rpms to 3000rpms then became normal. I pulled over to the enxt exit to check for any boost leaks and it seemed fine. It idles perfectly at 800rpms, give or take 10, and the tempurature was sitting perfectly at 180F. After that it kept doign it randomly after 2800 rpms. Sometimes in 4000, sometimes never. I went wot to redline in 2nd gear to end of 3rd gear to see if it would still do it. I did that 3 times, and it did two jerks in 2nd gear the first time at 4000rpms, the second pull it did no jerks, but the third pull brought another 2 jerks around 4300rpms. Flywheel problem maybe? Yesterday, when I shifted into 3rd gear, and when the clutch engaged, i heard a very quick metalic grinding, but went away after 1 second when I got onto the throttle. I don't know if this is relevent to my current problem. Spark plugs maybe? i changed them about 4000 - 5000 miles ago. NGK 10$ ones. any other suggestions would be highly appreciated....

[GabeS14]

the noise from clutch seems like its normal, mine is a stage 3 (spec) and makes noise almost everytime i transition slowly,
the jerk you feel, could it be a spike in the boost, because my greddy turbo timer was set wrong when i first got it and i would get these spikes in boost, whenever accelerating hard for a while, till i made the adjustments on it.
or also could be that theres oil on flywheel/clutch, could cause it to slip, but would feel like loss of acceleration, but with rpms climbing faster not really jerk.

maybe explain what kind of jerking you are feeling

[hungryjoseph]

the noise from clutch seems like its normal, mine is a stage 3 (spec) and makes noise almost everytime i transition slowly,
the jerk you feel, could it be a spike in the boost, because my greddy turbo timer was set wrong when i first got it and i would get these spikes in boost, whenever accelerating hard for a while, till i made the adjustments on it.
or also could be that theres oil on flywheel/clutch, could cause it to slip, but would feel like loss of acceleration, but with rpms climbing faster not really jerk.

maybe explain what kind of jerking you are feeling

it's the kind of jerk you feel when you let your girlfriend drive your racing clutch. aka hits you hard back and forth. it only lasts for a split second though. it was suggested to me on another forum that i'm experiencing fuel starvation. i've been fine all night for about 100 miles so far, no jerkyness. did some more 2nd/3rd gear pulls, heavy load, light load, middle load, 20% throttle, 40%, 60%, 90- 100%. seems to be normal. but im afraid it'll come back. the boost was definately not spiking at that level of load when it jerked/stutterd. My boost spikes to 14 - 15 psi for half a second before dropping down to 12 psi, but i don't get a jerk during that spike.

[GabeS14]

Ok gotcha,
Yea so i guess ime out on this one, lol...i just wanted to make sure you weren't having the same problem i had.

[hungryjoseph]

my gas guage broke on me one time, and i ran out of gas on the highway. i have a 255 walboro. you think that damaged my pump? it did it ONCE today, but it wasn't a jerk, more of a quick split second hesitation. i gassed it at 2800rpms, took it through 4500, but had the hesitation at 4000. and when i filled up the tank, i put in about 10 gallons. i turned the car on, and it acted like it had no fuel, and the motor just died. i turned it on again and put it into first, and when i went off it felt liek the car was running out of gas, but was fine after 10 seconds and drove normal. is my fuel pump damaged from running out of gas that one time?

[uthemofo]

pump is fine..its probably a combo of plugs and some kind of vacuum leek somewhere. Check every line and every "T" there is probably a leek somewhere.

[S13Disco]

yea sounds like a vacuum leak in the system. my car did that i found it was a small boost leak near the intercooler.