what could be causing trouble with 89 toyota p/u?

1989 TOYOTA PICKUP
180,000 MILES
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FOWENS
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seems to be missing really bad especially after motor warms up good. losing power and chugging/sputtering. we have replaced fuel pump, fuel filter, spark plugs and ignition module. also cleaned out gas tank. finally took it to a repair shop and they are at a loss to what the problem is. they said it wasn't showing any codes.
Jan 6, 2012 at 11:24 PM
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HMAC300
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check vacuum if it's 15" or below check for a plugged exaust.
is this carb or fuel injection?
Jan 7, 2012 at 12:40 AM
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FOWENS
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it's fuel injected. the mechanic said he was at a loss but that it could be the distributor or computer module.
Jan 7, 2012 at 1:03 AM
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HMAC300
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there is an EFI main relay, in the pic attached. see if relay A is same as B and try switching them to see if that helps. Otherwise i'd try the igniter first as it will be cheaper. the igniter is by the distributor.
Jan 7, 2012 at 1:10 AM
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HMAC300
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i forgot to send the pic lol.......
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Jan 7, 2012 at 1:11 AM
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FOWENS
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thanks for your help. will give it a try this weekend and see what happens. this has been going on now for 2 months and just when we think it's fixed it starts to act up again. the problem seemed to have just started out of no where and we have replaced everything we could think of that may be the problem. this is actually a truck that we bought for our son to drive to work but he's afraid to try to drive it at all now.
Jan 7, 2012 at 1:23 AM