Check for spark first. Make sure it's a good solid blue spark, not a weak thin yellowish spark. If you have no spark...
A bad ignition module or dirty connections at the ignition module are a possibility. They're in a dirty. dusty spot and the rubber seals and wire insulation tend to get baked and cracked. The module and coil need a good voltage supply to create a good spark. When the engine is cranking voltage drops. A few more lost volts due to dirty connections could be enough to weaken the spark during starting.
Finally, when did you last give it a tune-up? Worn, dirty spark-plugs can cause problems.
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