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Guys, I noticed a slight delay in engine start (slow cranking) about 3 times in the last week. But it did start in one push all 3 times but with a delay and almost misfired. Thing is this happened not in the early morning but in the middle of driving when I stopped for some groceries for about 10-15 min and came back. I suspected the battery but searching the internet I found there maybe problems in ignition, spark plug or anything. How should I get this checked? TIA

My car is EG8 Vtec one. The problem i'm having is, as soon as I hit the gas padel, it kinda boggs until it hits 2500 rpm's (+/- a couple hundred) then it picks up and runs strong. I cannot drive in traffic when the problem exists. Not all the time I see this problem and engine's heat or cold makes no difference. No misfire when I run on highway or accelating and stopped(In neutral) the car. No check engine light and no CEL error codes. I have changed the Dizzy and spark plugs,ECU, fuel filter and checked the timing. Finally swap the engine too with new reconditioned one. But I still have the problem. I have spent more than 2lakh by now. I am going to check injectos bocz I used 2 from old engine, fuel pump again. Your help is highly appreciate.