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Guys my 2003 civic ex vtech has 100k miles brand new timing belt headgasket new every part on car, seriously. Just put new engine in it, when i drive it sometimes rarely makes an extreme rattling sound from somewhere for like 5 seconds then goes away it sounds like one of the tires is shaking like insane, however they do get low sometimes but i dont think when this happens.. other than that it runs perfectly. the tires were all brand new however the car sat along time after blowing motor n back 2 tires go flat every couple days. could this be a tire or alignment issue, im stumped? i want to fix n im mechanically inclined however idk where to start for this one. Thank you so much guys, i know im new here, i owe you guys everything i will answer as many of other peoples questions as i can to pay it back. thanks guys.

 
Rep Power: 139

It would help us best diagnose the issue if you could determine the relative location or exact area from where the sound is coming. You mention a new engine but think the rattling may be coming from the rear tires. Is the sound coming from the rear for sure? does it do this at a certain speed or any speed?

 
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i notice it at like average speeds like 50mph. it just shakes bad for like3 seconds and stops . and happens every now and then.

 
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it's a rattling sound or a shake? confused still

 
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picture hitting like 10 speed bumps in a row at full speed.

 
Rep Power: 221

check that all your bushings and bolts are tight

 
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i noticed a tire balance weight in my driveway that fell off . could that cause it as well?

 
Rep Power: 221

having unbalanced tires certainly isn't going to help, having the car sit not moving on flat tires for a long time isn't going to help either.

start checking for loose/broken suspension things,
might want to get the balance on the wheels checked as well

 
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thanks everyone went to town fair tire today and they balanced the tire that had the weight fall off and rotated the tires . hopefully that did it.

 
Rep Power: 139

I can't imagine that would only cause problems at a certain speed range but was it fixed?