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misfire, lack of power on highways and hills


Topic starter

I have a 1988 Dodge B250 rv conversion with a 318 engine 116000 kilometers. Fuel filter,fuel-pump and sock,spark plugs,wires,distributor cap and rotor, coil and magnetic coil in distributor all changed. No engine codes. Mechanic said good spark and fuel injectors. When i am on the highway and give it gas it is like a miss and no power. I noticed more when under load like going up hill. The vehicle will shake and loose some speed if i let up on fuel will go away. Mechanic said he took it for a long ride and no problem and said wait until it happens all the time. Tired of paying for parts and no change. Any help would be appreciated. Afraid  

1 Answer

Well to me that sounds like a classic sign of either the fuel filters clogged up or the fuel pump is wearing out. Because if you give it a bunch of gas and it won't accelerate but then you let up it does that shows that you don't have enough fuel pressure for full speed but enough for a lower speed

I had the fuel filter on the frame and changed and a new fuel pump and sock installed when i first noticed. I went for a 1000 kilometer trip and problem still there. After this i changed spark plugs,wires,distributor cap,rotor,coil and magnetic coil in distributor went for a 200 kilometer ride problem is still there and there are no codes. I have been recently told to change the oxygen sensor and have ordered one but wont change till spring as rv van parked for winter.