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My 1995 chevy van with a 305 eng. starts good get up to25 to 30 mph start to bog down bad at frist i thought it was leaking antifreeze but no little water coming out of tail pipenow my van runs bad when iget up to speed i just change oil top off anti freezeneed help some people say its blown head gasketor crack block

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Check the vans oil to make sure the oil is not foamy or has a whitesh color to it, if so, then it is getting antifreeze into the oil, but if the oil checks out fine, then remove the spark plugs 1 at a time , and examined them to make sure they don't have any antifreeze on them, while you have the plugs out, give each cylinder a compression test to see if any of the cylinders have low readings, if so, and the other cylinders had good readings, then i would suspect a blown head gasket, or a cracked head, or block, also if all of the above checks out ok, then i would check the fuel filter, and if it hasn't been replaced, it could be stopping up on you , and not allowing the proper amount of fuel to be properly distributed to your vans engine. hope that this information has been helpful to you.

Posted on Apr 03, 2011

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