Bsilk1992

Hoping someone can point me in the right direction. I have brought a mk4 astra van 1.7cdti sportive. It had a cut out issue. I can drive it for a while then it will cut out and start back up after 10/15 seconds, but will only rev to 3 1/2 I’ve changed throttle body, housing, Egr and pipe to the engine as it was coming up egr and maf fault. While doing this a blank plate (coke can) dropped out of the egr pipe. After this the van was fine for about 2 miles then back to same issue. Someone mentioned crankshaft sensor so today I have changed that. Again 2miles down the road it cut out and again it started back up. I gave it some power to see how it would react and it blew the front rubber pipe of the throttle body! However I can still use full throttle and it’s not flagging up on the dash or on a scan! Thanks in advance!