Greetings all. I have a 1987 Dodge D150 with a 225 slant six. The truck was running well until a month ago. It started running very roughly when under load. AT under 1500 hundred rpm it runs well. Over 2000 rpm, or under load it starts missing and losing power. I have replaced the gas filter. Could it be bad gas? Or perhaps an ignition problem. Any suggestions are appreciated.

Does this truck still have the lean burn system on it?

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2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

Thanks for the reply. I'm not sure about the lean burn. However, I researched it a bit and learned that if it has lean burn, there should not be a vac advance on the dist. I'll check it today and find out. Thanks.

Some have a lean burn module on the air cleaner inlet and some have the system in behind the battery at the DS fender. I'm pretty sure your year truck should be over at the fender.

_________________
2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6