tonybabb

I have an 89 coupe I bought new in 89 and drive every day. For the past few months I have had an occasional misfire when driving at a steady speed, anywhere from 40 - 70 mph. It idles and accelerates fine, the problem only seems to occur on a light throttle opening. So far I've replaced the distributor cap, rotor, coil pack, wires and plugs all to no effect.

Where should I look next, I'm thinking maybe injectors? I replaced them about 100,000 miles ago so maybe I need to replace them? Do I need to replace all or just some. Would a diagnostic test at my local garage help point to anything?

Thanks for any advice,

Tony

antfarmer2

Ever replace your 02 sensor?

jv9999

I had a similar problem with my '87 right around 1200 RPM. Turned out that 2 extra degrees of timing upset it. Back to 6 degrees BTDC and all is well. Just something else to consider.