Hello all. I am brand new to this so please bear with me. I have a 2004 Nissan 350z with injen intake, throttle body spacer, and straight piped from headers. The test pipes were put in last year. I’ve had a big problem recently with my car. I started having very weird throttle response randomly. It started off maybe once a week, then increased until it got very bad. I kept getting the cars check engine light read but nothing was coming on until my o2 sensor. I was
told it was probably just my test pipes finally Being detected ok so they said they don’t know why I was having that issue said it might be fuel. This was about a week or so. Today I cold start the car and idles ok for the first minute then I as I clean my garage for the next 5 minutes. 3-5 times the Rpms drop to about 100 and back up to 1500 like it was about to stall. So all is ok at first. I drive around and car is feeling weak and slow like it has been and kept getting worse. If I revved it in neutral It would take forever to get up with lots of backfires and ect, sounded like it was just running to rich. So I get the car engine light checked again and same thing. I drive around and then later that day I get my engine like checked again because it’s gotten worse. Turns out my p0335 comes on! A simple fix I see so I buy the part drive to a buddies we install it in 10 minutes I leave. Car drive a perfectly fine. I get on the freeway do a hard second pull and I start to feel a few hicups almost like a misfire but not really. So I am like wtf you have to be kidding. I kinda start to baby it give it some gas and it just gets worse and worse. It got so bad that I couldn’t accelerate so I’m driving home my car is backfiring like crazy and I see my average mpg drops to 11mpg this is not a lie. I go through a 1/4 of a tank in 10 miles this is no joke. So the car is limping home but I’m afraid it won’t make it cus the gas light is on and I turn into the gas station. Put 20$ in head home and the car isn’t even wanting to idle to I give her gas to try to keep the rpms up. Car stalls heading out the gas station and I try to start and drive but it won’t. I try and it will start and die. Sometimes it won’t start or it barely catches and dies right away until the car dies. So I sit for 30 minutes waiting for a tow truck. Have a friend jump me just to see if I can figure out what’s going on and low and behold the car idles fine and no problems at all! All I did was take the mass air flow sensor off and
blow on it but I feel like this isn’t the culporate. If you read through this please help. Thank you