codes p0302, p0305,p0171, p1000

So is the miss only at idle and while driving down the road you cannot feel it?

both.

Is it a constant miss like those two cylinders are not firing? or does the miss come and go?

the miss is mainly at idle, but you can feel it a like when driving.

good afternoon,

the first thing I would do is verify fuel pressure. with the lean code. I would make sure the fuel pump is pumping the correct pressure. you can rent a tester at a parts store to check.

Roy

Checked the fuel pressure and it is getting the correct amount of pressure. It is getting 40 psi running with switch on 29 psi.

I would be looking for a vacuum leak with the p0171. it is more then likely a vacuum leak.