car jerks at randomly need help

[88e30dippin]

so i have replaced my afm with 325is one. i have replaced my spark plugs with bosch platinums and gapped it to .030 instead oem .028 because im running more fuel and air into the motor now. im starting to think my problem is either the idle control valve or the crank angle sensor. unless its because im using a e34 m20 ecu? im getting sick of this problem.

[hotballs]

With my experience of having a car that, for the most part, runs well and normal but on occasion, "bucks" or sputters slightly then goes away, it's either the main relay for the computer or the DME itself. Swap out both with working units and let us know what happens.

[JLegleiter]

Long time...

Anything causing bucking and sputtering should drop a code. Have you mashed the pedal?

I have experienced these same symptoms from the following (Edit) four things in the past:
Bad Main Relay
Bad Fuel Pump Relay
Faulty Evaporative Purge Valve
A deteriorating C101 connector under the intake manifold.

AFM, DME or CPS as others have said are also culprits.

On a side note, those platinum plugs are shit. Go for NGK or ordinary Bosch coppers.

[u3b3rg33k]

so i have replaced my afm with 325is one. i have replaced my spark plugs with bosch platinums and gapped it to .030 instead oem .028 because im running more fuel and air into the motor now. im starting to think my problem is either the idle control valve or the crank angle sensor. unless its because im using a e34 m20 ecu? im getting sick of this problem.

Why are you running platinums? Run recommended plugs at the recommended gap if you're having a problem.

Again, by what logic do you blame the ICV? it's after the AFM, so if it fails closed, you'll notice nothing while cruising. if it fails open, you'll have a high idle or less engine braking, it will not cause the car to buck or stall when you have your foot on the gas pedal.

[88e30dippin]

the platinums all i could find at the moment around the local part stores. the recommended was bosch coppers but i couldnt find them. the gap of the spark plugs are fine right now. i have changed out my afm to a 325is one because its all i could find. i think my crank angle sensor is bad because the wire coming out of the sensor is lose and you can see the wires which they are not supposed to be showing. so im guessing i need the 2.7l 325 afm, a new crank sensor and the original 88 325 2.7l 5 speed ecu. if that doesnt fix it then im going to put a 2.5l head and run the 325is computer and afm.

[88e30dippin]

oh and i had ngk's in my car before i switched a week ago to the bosch platinums. my cars running so rich that in less then a month after putting the brand new ngk's in, they were coated with black stuff and were little wet from too much fuel. im running m50 injectors.

[u3b3rg33k]

oh and i had ngk's in my car before i switched a week ago to the bosch platinums. my cars running so rich that in less then a month after putting the brand new ngk's in, they were coated with black stuff and were little wet from too much fuel. im running m50 injectors.

Do you have an M50? It doesn't sound like it. Perhaps you should be running 14# injectors?