when i am cruising at 75-85 the car will begin to sputter. If i give it more gas it will not accelerate and the sputter will get worse and and the car will begin to vibrate horrible. I have tried to change the plugs out but it only worked for a couple of weeks, then the problem persisted. i was wondering if anyone has had any problems like this or had any suggestions.



My mods are

buschur maf filter intake
3inch turbo back
dynoflash mail in
aps bov
forge mbc
255 walbro fuel pump
buschur deluxe intercooler
buschur lower intercooler piping



thanks
Josh

 

Do you have a Service light on?

 

Yes i do. i believe it is mainly because of my test pipe but i check for codes at work quite often. i have had a couple of misfires

 

Yea sounds like your getting misfire. what did your plugs look like when you changed them

 

Also what kind of plugs are you running

 

You need a Creader.

 

+1 and what are they gapped to. Also How many miles are on the car? Have you changed the wires?

 

The first thing that came to mind is a major boost leak. But I am thrown off by the "cruising at 75-80..." How is the car responding when you do this below/above the 75-80mph? What happens when you go through the gears at or near full throttle?


edit: Oh, I re-read your post and you said the problem went away after new plugs, I see.

 

if its not plugs or a boost leak, i say ur wires are shot. thats if ur using good plugs though

 

Here are the thnigs I would check if I had the same problem:

1. Plugs (you did that)
2. Plug wires
3. Coil packs
4. Swap back to stock BOV

 

BOV might be the problem but plags and wire as well since you said when you changed plugs the problem went away

 

the plugs were black. definatly fouled. i currently am using the br7 somthing they are ngk. the stock plugs. i also pressure tested my car and it has a small hole in the intercooler. buschur said they could fix it so i need to get up there and get it fixed. i also used the spark plug defouler on my o2 sensor to get rid of my cel. so i have corrected a couple problems that could contribute to the problem. also the car has 45,000 miles so it probably is time for some wires. any more suggestions this problem is driving me CRAZY!!!!