I only have OBD2 code reader. I now just have the p0171 and p0174. When the misfire happens I get all the misfire errors.

Seems to me like of the crack is down under the intake manifold, a smoke machine on hand isn't going to help much.

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2003 X5 3.0i Silver (build 07/03)
2006 X5 3.0i Blue
1977 Ferrari 308 GTB
1994 Ferrari 348TS Speciale #14/15
1989 Ferrari Testarossa