When I'm on the highway doing any speed 60,65,70... with 10%-15% throttle the car will stutter and shake (not violently) and when I try to accelerate it makes a slight '2 step' sound but if I accelerate through it, its fine.

Did a tune up- oil, plugs (yes, gapped) and still same result

 

What are you using to tune it with? Some older programs, such as uberdata, dont have IAT correction so you need to retune every winter/summer. Maybe at half throttle your running lean. Did this just happen out of nowhere? If so, Tps could be taking a dump. Setup, etc?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hotimportcrx &raquo;</TD></TR><TR><TD CLASS="quote">What are you using to tune it with? Some older programs, such as uberdata, dont have IAT correction so you need to retune every winter/summer. Maybe at half throttle your running lean. Did this just happen out of nowhere? If so, Tps could be taking a dump. Setup, etc? </TD></TR></TABLE>

its tuned on s200b, yeah kinda happened out of nowhere


Modified by visine at 1:48 PM 7/29/2008

 

Probably getting a little lean. I take it no wideband?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SovXietday &raquo;</TD></TR><TR><TD CLASS="quote">Probably getting a little lean. I take it no wideband?</TD></TR></TABLE>

I was thinking the same thing

 

Sounds like it may need to go back to the tuner to smooth out the data tables. This can happen a lot when tuning at certain RPMs.

 

i had a similar problem, car wasnt throwing any codes then one day i unhooked the o2 for some reason and and it stopped doing it.

 

simple steps first.....check your spark plug wires. makes sure they are actually connecting to the spark plug.

 

id check for a misfire first

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TurbodTegSfaria &raquo;</TD></TR><TR><TD CLASS="quote">id check for a misfire first </TD></TR></TABLE>

yeah that was eaiser to say than what i said.

 

My car started doing the same thing out of the blue one day... One of the wires going to my o2 sensor was barely coming out of the connector, but it was just enough to lose a connection, causing it to run like rotten ballz.