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When changing the coil pack it's an electronic reset. Disconnect the battery and allow the ECU to reset and reconnect the battery after 10-15 minutes or so and give it a restart try.
Ensure the radio and all power draws are turned off initially.
If it doesn't reset check to see that the pack is plugged in secure and it's the right one for your model.
Also try some fuel additive as it may be a diluted fuel issue that cropped up in the time it took you to replace the pack if it's set for a bit.
Also check your wires, plugs and main ground connection to ensure they're all secure.
Lastly ensure your fuel relay cube didn't short out when the coil pack went as well.
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Code 12 means you are in test mode, code 34 is a problem with the map sensor, and code 35 is a problem with the idle control valve. But those two codes could show up if you disconnect those sensors or if the engine is having other problems. In situations where the engine stalls, it is very easy to overlook something or assume a component is working. Treat it like a no start. Pull a plug wire and watch the spark as the engine dies. Use carb cleaner or starting fluid to boost fuel supply. You'll have to figure out if it is loosing spark or fuel to proceed. Things like the coil, the stator in the bottom of the dist, or a relay can be the cause. Even low fuel pressure.
ing. mod. and coil pack may be starting to go bad had same trouble with mine only a tune-up problem solved then came back be fore i put car on di machine found that coil pack was bad! when if you scange coil pack or ing. mod. replace all, if not will have problems again.
hi, i need to know something about your car in order to help you.
does your car have a distributor or 2 coil packs under the manifold.
there is 2 different problems.
i think your prob is your fuel pump breaking down under load, its common, get back to me 1st with my question before u do anything.
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