Hey guys, so I've been having some issues with my 07 V36 350GT Sedan for awhile now. The issues are on and off but now its present every day and it's starting to annoy the shit out of me.
1) At cold start / first drive for the day, when driven, the car would stutter (where RPM fluctuates and you can feel the car bucking). This issue is now present every time I drive if the car has been left to cool down. Initially I thought it was a vacuum issue but found no vacuum leaks.
There were talks about transmission issues and even engine oil issues in 350/370z forums but I am not sure if this is it.
2) Lately when I start the car, cranking it talking longer, some days it tries to crank, while rpm is v low it starts popping a few times. Stepping on the accelerator tends to get the crank going.
This lead me to think it's fuel pump, injector or coil packs not working properly.
I get no error codes whatsoever and am at my wits end. My mechanic said maybe try replacing the fuel pump first and go from there. OEM pumps looks to cost around $650 and up. Not sure if I'm looking at the right thing.
Would love some opinion re the issues but also opinions on if I should get OEM fuel pumps or look at after market ones?