I have an 89 SC w/ a 5 speed transmission 160,000 miles. When driving there is a momentary loss of tach signal and what seems like 1/2 the cylinders stop firing causing the car to buck and jump. the car will still idle but under power it is very, very rough, suddenly the tach signal returns and the car runs smoothly. The frequency and duration is increasing. The last couple of times, this lasted for several miles before smoothing out again.
Some history, I have had a broken Harmonic balancer (twice). The first time the bracket that holds the crank position sensor also was broken and subsequently repaired. I have not replaced either the cam sensor or the crank sensor. About a year ago I did replace the ignition control module and the ignition coil.
Some history, I have had a broken Harmonic balancer (twice). The first time the bracket that holds the crank position sensor also was broken and subsequently repaired. I have not replaced either the cam sensor or the crank sensor. About a year ago I did replace the ignition control module and the ignition coil.