Hello, I have an 86 325 eta with just over 308k on it. Been running great till recently I've noticed what I could only guess was a miss. My friend hooked a timing light up to it and found that the front half of the plug wires had strong consistent spark while the rear 3 cylinders had more eratic spark. Having said that, the cap and rotor have been replaced within the last 10,000 miles and the timing reading off the coil was strong and consistent. Any ideas? Is there a chance my ecu is on the fritz?