46addict
13726548
No modifications to the car, all stock. I have owned it and driven it regularly for over a year. Had all of the plug boots off and checked for carbon tracks and put new silicone grease on them, all were good. Only one vacuum line on the car and I have checked it end to end. the fuel trims show perfect so no vacuum leaks.
There is more than one vacuum line to check. The brake booster line I believe tees into the fuel pressure rail sensor on the driver's side. Then there is one going from the passenger side valve cover to the intake tube if you left the stock PCV system alone.
Looks like you've already replaced the FRPS so I'm sure you got a chance to inspect that vacuum line, but it won't hurt to check the other areas. And I've been told it's good practice to replace the coil boots ($5 each) each time you change the plugs. The coils inside them go bad over time and when I was chasing a misfire/surging issue, changing these fixed the problem.
Last edited: