Backfiring/choking Up When Cold

[deadweight]

ive only owned my skyline for about a month, but this has only started happening over the past few days.

in the mornings, when it first gets going its like its flooding or choking up with fuel. theres no black smoke or anything but the engine itself just feels like its choking up, then the idles will go really high for a few minutes til it warms up. i mean higher then the usual rise with a cold start, up to around nearly 3k. once its warmed up this stops however.

its also backfiring alot more then usual. in particular in between gear changes, it used to only back fire if i put my foot down and shifted but now its doing it even low rpm gear changes without planting it.

i also noticed on the way to work today, that my fuel pressure gauge was going all over the shop. it would jump up to around 70 psi, then jump back to 40psi, and just keep shifting around like that. also sat on 80psi whilst i was just coasting down a hill at 60ks. this was definately not doing this a few days ago.

could there be something thats causing all these issues to be occuring? just seeing as they seem to be related to fuel in some way or another. even possibly shit fuel?

[StevenCJR31]

take a look a the plugs, they may be worn/fouled and need replacing