[tbaig]

This morning I turned my car on and it went through it's cold start process. I let the car sit for about a minute and noticed that the RPMs started dropping, the car was shaking and the engine almost turned off.

Has anyone encountered this issue. If so, what could it be?

The mods I have are:
-catless downpipe
-BMS tune (i am not running any map)

[Texan2er]

I have a similarly rough cold start currently. Lasts about 30 seconds before it starts idling normally. Loud, but normal.

My research on this so far points to a possible high pressure fuel pump issue when this is occurring. I just keep being lazy and not going to the dealership.

[hwntime]

Originally Posted by tbaig

This morning I turned my car on and it went through it's cold start process. I let the car sit for about a minute and noticed that the RPMs started dropping, the car was shaking and the engine almost turned off.

Has anyone encountered this issue. If so, what could it be?

The mods I have are:
-catless downpipe
-BMS tune (i am not running any map)

What kind of gas are you using? It could be that or many other things like an O2 sensor, fuel pump, MAF sensor, etc. but I'd start with the actual fuel. If you're using cheapy low octane fuel, I'd suggest filing with the highest octane you can find in your area from a top tier station like Chevron, Shell, or 76. Maybe run a bottle of Techron through it too as an extra measure.