1990 BMW 750iL Q&A

1990 BMW 750iL Question: rough idel first start also misfire

runs rough when first starts like missing -
Answer 1
Rough running could be due perished breather hoses in the back of the engine, perished intake manifold gasket or some other vacuum leak Is the car misfiring constantly? what type of fuel do you use? is it from a reputable source? remove coil covers and check coils and plug condition, common for the rocker cover gasket to leak and the coil/plug valley fill with oil causing a misfire. -