Lost spark or my marbles

[tomminajar]

Ok I go for a drive 91 GTI 1.8 8V get a mile or so RPMs start to drop engine dies. I stop. Starts right back up- minute later same thing - I coast shift to Neutral (automatic) flick ignition off on rpms pickup and return to normal for the next 30 seconds - Then same thing happens over and over-
Next day everything is fine for a few days thensame frickn thing happens (Replaced Ignition module - no help) Any ideas ? Anyone ? Please ?

[boschmann]

Are you sure it's losing spark? Have you thought about the fuel pump relay?

[tomminajar]

Originally Posted by boschmann

Are you sure it's losing spark? Have you thought about the fuel pump relay?

I'm not sure about the spark - its just a guess . The engine will "choke and sputter" till it dies or I flick ign ition on/off -

Then it's fine for a 1/2 mile or so - Any idea how i could tell if its spark or not while I'm driving ? Relay sounds like an idea -I could put a gauge on the fuel rail and watch it while driving problem is it only happens once in a while - Do you know how to check the relay off hand- My VW book seems to have taken a walk...

[boschmann]

Watching the fuel pressure is a good idea if you can watch it as it dies. You can try feeling the relay when it dies to see if it's getting too hot. It's position #6, upper right. Relays are difficult to test but you can try inserting a jumper wire into the relay's two larger slots (#27 & #33) on the fuse panel to bypass the relay & see if the problem stops. A failing main or lift pump could also be at fault.